WHO final

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Electrical Inspection Report of
Federal EPI Ware Houses

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Contents
1. Introduction:............................................................................................................ 4
2. Electrical survey Objective:................................................................................... 4
3. Scope of Work: ....................................................................................................... 4
4. Methodology: .......................................................................................................... 4
5. As built/ As Installed drawings:............................................................................. 5
Referred Pages (1-24)
6. Electrical Network Condition:................................................................................ 6
Main Distribution Company Supply and Generator Supply: .................................................... 7
Substation: ............................................................................................................................15
Ware House: .........................................................................................................................26
Fire Alarm System:................................................................................................................58
CLOSED CIRCUIT TV (CCTV) SYSTEM: .............................................................................61
Exit Guide Boards:.................................................................................................................63
RECOMMENDATIONS FOR PANEL BOARDS: ...................................................................65
7. Standards followed: ............................................................................................. 77
Low Voltage Switchgear and Switchboards: ..........................................................................77
Summary: ..........................................................................................................................77
Reference International Standards:....................................................................................77
Reference for Best international Practice: ..........................................................................78
General Observation:.........................................................................................................78
Power Supply Cables: ...........................................................................................................80
General Observations: .......................................................................................................80
Cable in Conduits:..............................................................................................................81
Conduits:...............................................................................................................................81
Lightning Protection:..............................................................................................................82

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Grounding and Bonding:........................................................................................................82
Capacitor Banks:...................................................................................................................83
General observations / recommendations:.........................................................................84
8. Proposed Drawings:............................................................................................. 85
9. Proposed Drawings for Nine New Units: ............................................................ 86

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1. Introduction:
The execution of the order follows for evaluation of electrical distribution network in accordance
with electrical standards and international best practices in support of sustainable electrical
network development.
2. Electrical survey Objective:
The key objective of this task is to determine and ensure how the quality of electrical service
and electric supply does not decline to the FEDERAL EPI ware houses at NIH Islamabad.
3. Scope of Work:
The scope of work was to inspect and assess compliance report for electrical distribution
network installed for the supply of labs.
The scope of evaluation for up gradation is as follows:
i. To inspect the electrical distribution network installed for EPI warehouses.
ii. To evaluate the installed electrical distribution network as per electrical norms.
iii. Prepare and submit as built drawings for existing electrical distribution network for EPI
ware houses
iv. Prepare and submit the proposed drawing for modernization/up gradation.
v. Prepare and submit proposed design drawing for the nine new units.
4. Methodology:
The methodology involved the implementation of this approved electrical assessment survey to
capture relevant data to meet the scope of work. During this electrical compliance survey,
interviews and discussions were held with relevant personal to clarify the response of our
internal electrical protocols.
Visual inspections were carried out to determine the conditions of the networks on the intake
substations, transformers and over head lines.
The team was accompanied to the sites by nominated officials from WHO and NIH. Basic
electrical tools were also used to verify the conditions of the switchgear, distribution boards and
end use power sockets.
On completion of the electrical compliance evaluation, draft report was prepared by the team
and submitted to the customer for corrective actions / up gradations plans based on the

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findings. Implementation of corrective actions plan is later enforced and monitored as a
separate project.
5. As built/ As Installed drawings:
Through this drawing, we intent to provide true detail conditions and important information about
the installed electrical infrastructure of M/s WHO FEDERAL EPI Ware Houses including
associated works.
As we did not find any plan/designed drawings for the benchmarking, therefore to get the basic
useful information we explored the installed individual distribution panels and boards in live
environment, nearest to possibility.
It was observed that the amendments /alteration /modifications were done in the electrical
power supply network without considering any design parameter and enhancement of electrical
capacity.
It was also observed that existing electrical network was installed without considering the
electrical coordination study. Therefore the integrity of electrical network could not be verified.

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6. Electrical Network Condition:
The condition of most of the networks inspected was better then MBL and Virology labs but not
as per standards. The majority of the equipment needed urgent attention as this has a direct
influence on electrical network performance quality for supply and safety. The following photos
are evidence of the condition found due to lack of maintenance including alterations in electrical
distribution boards without consulting any design and plan.
Ware houses and substation did not comply with most of the electrical standards/norms and
electricity network is not in a very acceptable condition.
There is no proper preventive maintenance plan and only emergency/corrective maintenance
was done depending upon the nature of the fault.
The electrical network system has not been upgraded for a long time and is no longer properly
adequate to handle the electrical load requirement for future loads
The general condition of substation and extended network is not in acceptable condition as it is
very old, obsolete and the protection system is not intact. Therefore it needs to be upgraded as
soon as possible.
Legend: Red for faults and findings
Black for Recommendations

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Main Distribution Company Supply
and Generator Supply:

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TRANSFORMER SILICA GEL
1. TRANSFORMER SILICA GEL TO BE
REPLACED AS IT HAS CHANGED
ITS COLOUR TO BROWN
2. TRANSFORMER OIL DI-ELECTRIC
SHOULD BE DONE TO CHECK THE
STRENGTH OF OIL
3. TRANSFORMER OIL LEVEL TO BE
VERIFIED AS NO INFORMATION
AVAILABLE ON TRANSFORMER
DISTRIBUTION SUPPLY METERING
PANEL
1. PANEL NEED TO BE REPLACED
AS ITS RUSTED AND ITS GLASS
PLATE IS DAMAGED.
2. SLEEVES TO BE PROVIDED TO
PROTECT CABLE DAMAGE
3. CABLE GLANDS TO BE
PROVIDED
1. PANEL SHOULD BE LOCKED
WITH PAD LOCKED.
2. PANEL EARTH TO BE PROVIDED.

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DISTRIBUTION SUPPLY METERING
PANEL
1. PANEL CLEANING TO BE DONE
PROPERLY
2. WIRES TO BE ARRANGED
PROPERLY AND TAGGING TO BE
DONE WITH PROPER FERROLES
3. PANEL DOOR , CT’S AND METER
EARTH TO BE PROVIDED.
4. CABLE GLANDS TO BE SEALED
TO PROTECT FROM DUST ,
VERMIN AND INSECTS
LOW POWER FACTOR AND MAXIMUM
DEMAND INDICATOR PANELTY
1. LOW POWER FACTOR PENALTY IS BEING IMPOSED AS SHOWN ON BILL. POWER FACTOR
IMPROVEMENT PANEL SHOULD BE INSTALLED.
2. LOAD IS OVER THE ALLOWED LIMIT ( SANCTIONED LOAD) SO MAXIMUM DEMAND INDICATOR
METER READING PENALTY IS ALSO IMPOSED. SANCTIONED LOAD TO BE INCREASED FROM
IESCO FROM 266 kW TO 800 kW AS THE NEW NINE UNITS WILL ALSO ADD AND FOR FUTURE
LOAD IN DRY WARE HOUSE

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MAXIMUM DEMAND INDICATOR
PANELTY
3. MDI PENALTY IMPOSED COMPLETE YEAR
GENERATOR EARTH
1. GENERATOR EARTH CABLE TO BE CLAMPED
WITH WALL AND PROPERLY ARRANGED. IT
SHOULD BE BURRIED INSIDE EARTH AND
CONNECTED TO EARTH PIT
2. EARTHING PIT TO BE PROVIDED WITH
PROPER TAGGING AND COVER

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RECOMMENDATION FOR EARTHING
CLAMPS FOR WALL AND EARTHING PIT
EARTH PIT EARTH CABLE CLAMPS

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DISTRIBUTION SUPPLY AND GENERATOR
BURRIED CABLES TO SUBSTATION
1. LV CABLES ROUTE FROM WAPDA AND GENERATOR TO MAIN SUBSTATION SHOULD BE
PROPERLY IDENTIFIED. CABLES MARKER PLATE SHOULD BE PROVIDED . DETAILS SHOWN
IN NEXT SLIDE
2. STEEL WIRED ARMOURED CABLES TO BE USED FROM TRANSFORMER TO MAIN
DESTRIBUTION BOARD FOR PROPER PROTECTION.

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RECOMMENDATION FOR BURRIED
CABLES
RECOMMENDATIONS FOR LOCALLY
EARTHING SYSTEM

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RECOMMENDATION FOR GENERATOR
1. FUEL PUMP SHOULD BE PROVIDED FOR FILLING THE GENERATOR FUEL
TANK . FUEL TANK SHOULD BE ALSO AVAILABLE
2. GENERATOR MAINTENANCE LOG SHEET SHOULD BE MAINTAINED
GENERATOR INSPECTIONS
1. AS GENERATOR HRS HAVE CROSSED 2000
FOLLOWING INSPECTIONS ARE TO BE DONE
I. GENERATOR LEAD ROUND CABLE CHECK
II. GENERATOR SET VIBRATION TEST/RECORD
III. GENERATOR WINDING INSULATION TEST
IV. STATOR LEAD CHECK
COMPLETE MAINTENANCE SCHEDULE IS ALSO
ATTACHED AT THE END OF REPORT

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SUBSTATIOIN BUILDING
RECOMMENDATIONS
1. MAIN BUILDING EARTH SHOULD BE PROVIDED
WITH EARTH ROD AS ITS NOT VISIBLE
2. ATS, MANUAL CHANGE OVER, PHASE FAILURE
PANELS SHOULD HAVE EARTH TERMINALS THAT
SHOULD BE CONNECTED TO MAIN EARTH
3. EMERGENCYLIGHT TO BE INSTALLED IN MAIN
SUBSTATION BUILDING FOR
EMERGENCY/MAINTENANCE SHUTDOWNS
4. FIRE ALARM SYSTEMSHOULD BE INSTALLED AS
PRESENTLY NOT AVAILABLE AND FIRE
EQUIPMENTS LIKE SAND BUCKETS, FIRST AID
BOX AND FIRE EXTINGUISHERSTO BE PROVIDED
5. CABLE TRAY OR CONDUITS TO BE INSTALLED
6. SINGLE LINE DIAGRAM TO BE PROVIDED ON A1
SIZE TO BE PROVIDED FOR COMPLETE SYSTEM
7. DISTRIBUTION BOARD SHOULD BE PROVIDED.
AT PRESENTONLY ONE THREE PHASE BREAKER
IS USED FOR LIGHTS AND FANS WHICH IS NOT
ACEPTABLE
RECOMMENDATIONS FOR
SUBSTATION EARTH LEAKAGE
PROTECTION DEVICES
THE SELECTION OF EARTH LEAKAGE PROTECTION DEVICES AT MAIN SWITCHBOARDS
MUST TAKE INTO ACCOUNT THE REQUIREMENT FOR DISCRIMINATION WITH
DOWNSTREAM PROTECTIVE DEVICES. FOR SMALL SUPPLIES (200A OR LESS), A 300
MA RCD DEVICE MAY BE USED, WITH TIME DELAY OF 200 MS. FOR LARGER SUPPLIES
(ABOVE 200A), EARTH LEAKAGE PROTECTION RELAYS MAY BE USED IN CONJUNCTION
WITH MCCBS OR ACBS INCORPORATINGA TRIP UNIT (E.G. 1A, 3A, 5A WITH A
SUITABLE TIME DELAY TO ENSURE PROPERDISCRIMINATIONWITH DOWNSTREAM
PROTECTIVE DEVICES). IRRESPECTIVE OF THE EARTH LEAKAGE PROTECTION
PROVIDEDAT THE MAIN SWITCHBOARD, THE INCOMER MCCB OR ACB SHALL HAVE
SHORT-CIRCUIT PROTECTION TO ENSURE TRIPPING WITHIN 400 MS TAKINGINTO
ACCOUNT THE EARTH FAULT LOOP IMPEDANCE. AT PRESENTTHERE IS ONLY SHORT
CCT PROTECTIONINSTALLED ON MCCB

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SUBSTATION INCOMING PANEL
1. AMMETER TO BE CONNECTED
AND SELECTOR SWITCH TO BE
PROVIDED
2. VOLTMETER WIRES ARE ALSO
DISCONNECTED AND ONLY
SINGLE PHASE VOLTAGEIS
SHOWING. ALL CONNECTIONS
OF SELECTOR SWITCH TO BE
COMPLETED
SUBSTATION INCOMING PANEL1. SUBSTATION INCOMING PANEL IS HAVING NO
INFORMATION REGARDING POWER FACTOR OF
COMPLETE SYSTEM. POWER FACTOR DISPLAY
METER SHOULD BE INSTALLED
2. INCOMING CABLE SHOULD BE FIRST COMING TO
PHASE FAILURE PANEL BREAKER AND THEN TO ATS
AND FINALLY TO MAIN DISTRIBUTION PANEL. MAIN
BREAKER WITH PHASE FAILURE PROTECTION
SHOULD BE 800A AND DISTRIBUTION BREAKER TO
BE 600A. AT PRESENT 600A BREAKER IS HAVING
PHASE FAILURE PROTECTION WHILE 800 A
BREAKER IS HAVING ONLY SHORT CIRCUIT
PROTECTION
3. CABLES TAGGING TO BE PROVIDED WITH
INCOMING AND OUTGOING INFORMATION AND
CABLE SIZE.
4. CABLE TERMINATION TO BE DONE PROPERLY AND
SLEEVES TO BE PROVIDED
5. MAIN PANEL BREAKER TAGGING TO BE DONE
6. STANDARD NOT FOLLOWED AS 4X 4 CORE CABLE
INSTALLED WITH THREE POLE BREAKER. IT SHOULD
BE FOUR CORE CABLE ONLY

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SUBSTATION INCOMING PANEL
7. LOAD SCHEDULE AND PANEL DIAGRAM
TO BE PROVIDED
8. MAIN INCOMING PANEL DOORS FROM
BEHINDSHOULD BE KEY LOCKED AS
BUS BAR ARE ENERGIZED
9. EARTH ELECTRODE NOT VISIBLE
OUTSIDE MAIN SUBSTATION BUILDING
10. PANEL IS RUSTED . NEEDS PROPER
CLEANING
11. MISSING GLANDS TO BE PROVIDED
12. EARTH LEAKAGEPROTECTION DEVICE
TO BE INSTALLED
RECOMMENDATION FOR EARTH
ELECTRODE

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PHASE FAILURE PANEL
1. CABLES TAGGING TO BE PROVIDED WITH
INCOMING AND OUTGOING INFORMATION AND
CABLE SIZE.
2. 4X4 CORE CABLE USED FOR THREE PHASES
SEPARATELY. IT SHOULD BE ONLY FOUR CORE/
SINGLE CORE CABLE WITH PROPER SIZE. CABLE
TERMINATION TO BE DONE PROPERLY AND
SLEEVES TO BE PROVIDED
3. PANEL AND DOOR EARTHING TO BE CONNECTED
4. BREAKER AND PHASE FAILURE CONTACTOR
TAGGING TO BE DONE
5. PANEL DIAGRAM TO BE PROVIDED
6. CABLE GLANDS TO BE PROVIDED
PHASE FAILURE PANEL
7. MAIN INCOMING PANEL SHOULD
INCORPORATE WITH PHASE FAILURE AND
EARTH LEACKAGE PROTECTION.

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MANUAL CHANGE OVER PANEL
1. CABLES TO BE ARRANGED PROPERLY BY
INSTALLAING VERTICAL CABLE TRAYS .
2. INCOMING AND OUTGOING CABLES
NEEDS TAGGING.
3. CABLE GLANDS AND SLEEVES TO BE
PROVIDED AT INCOMING AND OUTGOING
OF PANEL TO PROTECT FROM CABLE
DAMAGE AND EXTRA HOLES TO BE
COVERED
4. PANEL NEED TO EARTHED AND TAG
PROPERLY
5. PANEL SHOULD BE PROVIDED WITH KEY
OR PAD LOCK FOR SAFETY
6. PANEL NEED TO BE REPAINTED
MANUAL CHANGE OVER PANEL
7. RED , YELLOW ,BLUE SLEEVES TO BE
PROVIDED FORPROPER INDICATION
OF PHASE
8. PANEL DRAWING TO BE PROVIDED
9. PROPER CLEANING TO BE DONE

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SAMPLE RECOMMENDATION
CABLE TRAY , CABLES PANEL WITH TAGGING

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AUTO TRANSFER SWITCH PANEL
1. BREAKERS AND CONTACTOR
TAGGING TO BE DONE
2. EARTHING BAR TO BE PROVIDED
AND PANEL EARTHING TO BE DONE
3. PANEL DRAWING TO BE PROVIDED
AUTO TRANSFER SWITCH PANEL
4. CABLE GLANDS AND SLEEVESTO BE PROVIDED FOR THE
INCOMING AND OUTGOING CABLES
5. PANEL SHOULD BE TOTALLY CLOSED
6. INCOMING AND OUT GOINGCABLES SHOULD BE PROVIDED
WITH TAGGING AND SIZE

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GENERATOR BATTERY CHARGER
1. GENERATOR BATTERY CHARGING CABLE TO BE
INSIDE GI CONDUIT OR IT SHOULD BE FIRE
RATED AND CHARGER SHOULD BE INSIDE BOX.
IT SHOULD NOT BE VISIBLE
SUBSTATION TRENCH
1. CABLES NEED TO BE ARRANGED
PROPERLY WITH CABLE TRAYS
2. TRENCH COVERS SHOULD NOT OF
CARD BOARD OR THERMOCOLE AS IT
COULD EASILY BREAK. WE PREFER TO
BE STEEL COVER WITH HANDLES AS
SHOWN

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SUBSTATION OUTGOING BREAKERS TO
WARE HOUSES
1. PANEL NAME TAGGING TO BE
PROVIDED AS ITS MISSING
2. BREAKERS TAGGING TO BE
PROVIDED WITH OUTGOING
INFORMATION AND CABLE SIZE.
3. LOAD DISTRIBUTION SCHEDULE TO
BE PROVIDED
4. PANEL SHOULD HAVE INSPECTION
STICKER LIKE QC PASSED
5. PANEL MAIN BREAKER TO BE
PROVIDED IN THE SAME PANEL AS
AT PRESENT ITS IN PHASE FAILURE
PANEL
6. OUTGOING BURRIED CABLES
DRAWING ROUTE TO BE PROVIDED
SEPARATE AS NO DETAILS PROVIDED
SUBSTATION PANEL DISTRIBUTION
SIDE
7. SPARE CABLES TO BE REMOVED
AND CABLES ENDS TO BE
PROVIDED WITH END CAPS
8. TRENCH AND CABLES TO BE
PROPERLY TAGGED, CLEANED
AND ARRANGED
9. EARTH LEAKAGE PROTECTION
DEVICE TO BE INSTALLED

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RECOMMENDATION FOR SUBSTATION
EARTHING
1. ALL FOUR WARE HOUSE BUILDINGS AND
SUBSTATION SHOULD HAVE SEPARATE
EARTH WITH TAGGING AS THEY ARE
SEPARATE BUILDINGS . AT PRESENT ALL
EARTH CONDUCTORS FROM BUILDINGS
ARE CONNECTED TO SUBSTATION
BUILDING

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Ware House:
COLD WARE HOUSE 1:

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SUB MAIN DISTRIBUTION BOARD
COLD WARE HOUSE 1
1. BREAKERS, CT’S /FUSES
TAGGING TO BE PROVIDED
2. LOAD SCHEDULE TO BE
PROVIDED
3. PANEL NEED TO BE KEY OR PAD
LOCKED
4. TWO CABLE SHOULD NOT BE
TERMINATED ON SAME
BREAKER
5. FUSE STOPPER TO BE PROVIDED
6. BREAKERS PLATE COVER TO BE
PROVIDED
7. AT PRESENT PANEL DOOR
CAN’T BE LOCKED BECAUSE OF
CABLES ARRANGEMENT
8. MAIN BUILDING EARTH TO BE
PROVIDED
9. BUS BAR COVER MISSING
COLD WARE HOUSE 1
10. CABLE GLANDS TO BE
PROVIDED
11. VOLTMETER AND
INDICATION LAMPS NOT
WORKING
12. EARTH LEAKAGE
PROTECTION DEVICE TO BE
PROVIDED

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UNDERVOLTAGE OVERVOLTAGE PANEL
BOARD 2
1. INCOMING AND OUTGOING CABLES HAVE
NO TAGGING
2. GLANDS SHOULD BE PROVIDED
3. EARTHING SHOULD BE PROVIDED AS
PRESENTLY MISSING
4. CONTACTOR AND RELAY TAGGING SHOULD
BE PROVIDED
5. PANEL NAME SHOULD BE PROVIDED
6. CABLES SHOULD NOT BE EXPOSED . IT
SHOULD BE INSIDE CONDUIT AS ITS WARE
HOUSE AREA.
7. PANEL SHOULD BE PROPERLY KEY/PAD
LOCKED
8. INNER COVER PLATE TO BE PROVIDED
COLD UNITS DISTRIBUTION BOARD 3
1. INDICATION LAMPS TO BE REPLACED
2. INNER PLATE COVER TO BE PROVIDED
3. BREAKERS TAGGING TO BE DONE
4. BLACK CABLE USED FROM BUS BAR TO
BREAKER. COLOUR CODE TO BE FOLLOWED
FOR DISTRIBUTION BOX
5. BREAKER STOPPERS ON DIN RAIL TO BE
PROVIDED
6. CABLES SHOULD BE PROPERLY ARRANGED
8. FIRE ALARM EXPOSED WIRES OUTSIDE DB TO
BE COVERED INSIDE GI CONDUIT
9. LOAD SCHEDULE TO BE PROVIDED
10. EARTH LEAKAGE PROTECTION DEVICE TO BE
PROVIDED

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LIGHTING AND POWER SOCKETS FINAL
DISTRIBTION BOARD 4
1. PANEL TO BE CLEANED PROPERLY WEEKELY
2. RCD TO BE INSTALLED SEPARATELY FOR
LIGHTING AND POWER SOCKETS
4. PHASE WIRES, NEUTRAL AND EARTH
TAGGING TO BE DONE WITH CIRCUIT
NUMBERS
6. BLACK CABLE USED FOR ALL PHASES. IT
SHOULD BE RED , YELLOW AND BLUE
7. INTERNAL COVER TO BE PROVIDED AS ITS
MISSING
8. BREAKER OUTPUT WIRES TO BE AS PER
PHASE COLOUR. AT PRESENT ITS ALL RED.
9. PANEL DOOR EARTHING TO BE PROVIDED
DISTRIBTION BOARD 51. PANEL TO BE CLEANED PROPERLY
2. CABLES DRESSING TO BE DONE PROPERLY
NUMBERS
MISSING
9. BREAKER OUTPUT WIRES TO BE AS PER PHASE
COLOUR. AT PRESENT ITS ALL RED.
12. INDUSTRIAL SOCKET CABLES ARE DIRECTLY
TAKEN FROM 50A BREAKER . THERE SHOULD
BE SEPARATE THREE PHASE BREAKER AS ITS
RATING IS TOO HIGH

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1. DAMAGED INDICATION LAMPS TO BE
REPLACED.
BREAKERS . COLOUR CODE TO BE
FOLLOWED FOR DISTRIBUTION BOX
PROVIDED
7. EXPOSED WIRES OUTSIDE DB TO BE
COVERED PROPERLY
1. DISTRIBUTION BOARD NEEDS TO BE
CLEANED PROPERLY OR REPLACED AS ITS
RUSTED
2. BREAKERS AND CABLES TAGGING TO BE
PROVIDED
COVERED PROPERLY WITH GI CONDUITS
OR FIRE RATED CABLES TO BE USED
8. WEATHER PFOOF BOX IP65 RATED TO BE
INSTALLED AS ITS OUTSIDE
9. TWO WIRES SHOULD NOT BE TERMINATED
ON SAME BREAKER AS IN CASE OF ANY
FAULT BOTH UNITS GET SHUT DOWN

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OUTSIDE LIGHTS BREAKER
1. PHOTOVOLTIC CELL SHOULD
BE PROVIDED FOR
AUMATICALLY
CONTROLLING THE OUTSIDE
LIGHTS INSTEAD OF
MANUALLY SWITCHING
ON/OFF BREAKER AND
WEATHER PROOF MANUAL
SWITCH SHOULD BE
INSTALLED
2. LED LAMPS SHOULD BE
USED FOR ENERGY SAVING
3. WEATHER PROOF IP 65 BOX
TO BE INSTALLED AS ITS
OUTSIDE. THE PRESENT BOX
HAS NO SEALS FOR
WEATHER PROTECTION.
WALL MOUNTED COLD UNIT BREAKER
BOX’S
1. DB-7,8,9,10,11,12,13 PANEL DOOR CAN’T BE CLOSED AS CABLES
ARE TERMINATED INCORRECTLY
2. CABLES TO BE ARRANGED PROPERLY WITH CLIPS
3. TWO UNITS SHOULD NOT BE CONNECTED TO SAME BREAKER.
THERE SHOULD BE SEPARATE BREAKERS FOR EACH UNIT.
4. ALL EXPOSED CABLES TO BE INSIDE GI CONDUILTS OR FIRE RATED
CABLES TO BE USED

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OUTGOING CABLE TO COLD UNITS
1. PROPER CLEANING TO BE DONE ABOVE COLD UNITS AND EXPOSED WIRES TO BE
INSIDE GI CONDUITS
2. ALL EXPOSED CONDUITS SHOULD BE GI INSTEAD OF PVC. PVC ARE ONLY USED
INSIDE WALLS

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COLD WARE HOUSE 2
SELECTOR SWITCH MISSING FOR
AMPERE METER
COLD WARE HOUSE 2
1. BREAKERS TAGGING TO BE PROVIDED
3. PANEL NEED TO BE KEY OR PAD LOCKED
4. TWO CABLE SHOULD NOT BE TERMINATED
ON SAME BREAKER. THERE SHOULD BE
SEPARATE BREAKER.
5. BREAKER AND FUSE STOPPER TO BE
PROVIDED
6. 10A BREAKER FOR TWO EXHAUST FANS
SHOULD NOT BE HANGING LOSE INSIDE
PANEL. IT SHOULD BE INSTALLED ON RAIL

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COLD WARE HOUSE 2
7. BREAKERS PLATE COVER TO BE PROVIDED
8. AT PRESENT PANEL DOOR CAN’T BE
LOCKED BECAUSE OF CABLES
ARRANGEMENT
9. MAIN BUILDING EARTH TO BE PROVIDED
10. NO LUGS PROVIDED FOR 75A BREAKER IN
SMDB 1
11. NO GLANDS AND SLEEVES PROVIDED FOR
SMDB 1
12. PANEL NAME PLATE TO BE PROVIDED
13. RCD TO BE PROVIDED FOR EARTH
LEACKAGE PROTECTION
UNDERVOLTAGE OVERVOLTAGE PANEL
BOARD 2
1. INCOMING AND OUTGOING CABLES HAVE NO
TAGGING
2. GLANDS SHOULD BE PROVIDED
3. EARTHING SHOULD BE PROVIDED AS PRESENTLY
MISSING
4. CONTACTOR AND RELAY TAGGING SHOULD BE
PROVIDED
5. PANEL NAME SHOULD BE PROVIDED
6. CABLES SHOULD NOT BE EXPOSED . IT SHOULD BE
INSIDE CONDUIT AS ITS WARE HOUSE AREA.
7. PANEL SHOULD BE PROPERLY KEY/PAD LOCKED
8. INNER COVER PLATE IS MISSING

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RECOMMENDATION FOR
DISTRIBUTION BOARD
1. LIGHTING AND POWER
SOCKETS SHOULD HAVE
SEPARATE DISTRIBUTION
BREAKERS . AT PRESENT
SINGLE BREAKER IS USED
BOTH FOR LIGHTING AND
POWER SOCKETS.
2. RESIDUAL CURRENT DEVICE
(RESIDUAL CURRENT
CIRCUIT BREAKER) TO BE
INSTALLED FOR LIGHTING
AND SOCKETS
1. INNER COVER TO BE PROVIDED
2. BLACK CABLE USED . COLOUR CODE TO BE
PROVIDED
6. EXPOSED WIRES OUTSIDE DB TO BE INSIDE
GI CONDUITS OR FIRE RATED CABLE TO BE
USED
7. 32A BREAKERS EARTH CABLE SHOULD BE
TERMINATED TO EARTH BAR SEPARATELY

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8. RCD TO BE PROVIDED FOR EARTH LEACKAGE
PROTECTION
DISTRIBUTION BOARD 4
1. RCD TO BE INSTALLED
SEPARATELY FOR LIGHTING AND
POWER SOCKETS
3. PHASE WIRES, NEUTRAL AND
EARTH TAGGING TO BE DONE
WITH CIRCUIT NUMBERS
PROVIDED
5. BLACK CABLE USED FOR ALL
PHASED. IT SHOULD BE RED ,
YELLOW AND BLUE
6. INTERNAL COVER TO BE
PROVIDED AS ITS MISSING
7. BREAKER OUTPUT WIRES TO BE
AS PER PHASE COLOUR. AT
PRESENT ITS ALL RED.

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8. WIRES TO INDICATION LAMPS
TO BE FIXED WITH CLIPS
9. CONDUITS SHOULD NOT BE
VISIBLE. GLANDS TO BE
PROVIDED FOR PROPER FIXING
THE CONDUITS
DISTRIBUTION BOARD 51. RCD TO BE INSTALLED SEPARATELY FOR
NUMBERS AS MENTIONED IN
RECOMMENDATIONS
5. CABLE DRESSING TO BE DONE OK .BLACK
CABLE USED FOR ALL PHASED. IT SHOULD BE
RED , YELLOW AND BLUE
MISSING
8. CONDUITS SHOULD NOT BE VISIBLE. GLANDS
TO BE PROVIDED FOR PROPER FIXING THE
CONDUITS
9. WIRES TO INDICATION LAMPS TO BE FIXED
WITH CLIPS

39
PROVIDED
COVERED PROPERLY
7. MAIN BREAKER AT PRESENT IS OF 100A
HOWEVER AT THE SUBMAIN DISTRIBUTION
BOARD ITS 75A. THIS IS AGAINST THE
SYSTEM PROTECTION SCHEME
9. EARTH LEAKAGE PROTECTION DEVICE TO
BE PROVIDED
COLD WAREHOUSE 2 DISTRIBUTION
BOARD 6
10. CONDUITS SHOULD
NOT BE VISIBLE.
THERE SHOULD BE
GLANDS PROVIDED
AT THE END OF
CONDUITS

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RECOMMENDATION FOR EARTH
LEAKAGE PROTECTION
RCD
100mA
RCD
30mA
WARE HOUSE 2 COLD STORAGE
1. EXHAUST FANS SWITCH TO BE INSTALLED
AT 140MM HEIGHT FROM FURNISHED
FLOOR LEVEL FROM GROUND
2. EXHAUST FANS SWITCH FOR OUT SIDE
FANS TO BE PROVIDED AS PRESENTLY ITS
DIRECTLY CONNECTED TO BREAKER
3. GI CONDUIT TO BE INSTALLED . PVC
CONDUIT IS NOT ACCEPTABLE AS ITS FIRE
ZONE OR FIRE RATED CABLE TO BE USED
4. EXHAUST FANS SHOULD BE INTERLOCKED
WITH FIRE ALARM AS PER NFPA 72. SO
THAT IN CASE OF FIRE SMOKE SHOULD
NOT BE ACCUMULATED INSIDE WARE
HOUSE

41
BE PROVIDED FOR
AUMATICALLY
LIGHTS INSTEAD OF
MANUALLY SWITCHING
ON/OFF BREAKER AND
SWITCH SHOULD BE
INSTALLED
3. WEATHER PROOF BOX IP65
RATED TO BE USED AS ITS
OUTSIDE
BOX
1. MISSING PLATE COVERS TO BE PROVIDED FOR
DB-8 AND DB-9
2. ALL EXPOSED CABLES TO BE INSIDE GI
CONDUITS AND WIRE TERMINATION SHOULD
NOT FROM OUTSIDE AS PANEL DOOR CAN
NOT BE CLOSED
3. CABLES NEED TO BE PROPERLY ARRANGED
PROPERLY INSIDE ALL BOXES

42
BOX
4. ALL CABLES NEED TO BE PROPERLY ARRANGED
WITH CLIPS INSIDE WALL MOUNTED COLD
UNIT BREAKER
OUTGOING CABLE TO COLD UNITS
1. PROPER CLEANING TO BE DONE ABOVE COLD UNITS AND EXPOSED WIRES TO BE
INSIDE GI CONDUITS
2. ALL EXPOSED CONDUITS SHOULD BE GI INSTEAD OF PVC. PVC ARE ONLY USED
INSIDE WALLS

43
COLD WARE HOUSE TEMPERATURE
MONITORING STATION:

44
OUTSIDE WARE HOUSES
TEMPERATURE MONITORING PANELS
1. PANELS PLATE TO BE PROVIDED FOR
IDENTIFYING WARE HOUSES DATA
2. TEMPERATURE SENSOR WIRES INSIDE
WARE HOUSE SHOULD BE PROTECTED
WITH GI CONDUIT AS EXPOSED WIRES
ARE NOT ACCEPTABLE
RECOMMENDATION FOR AUTO
DIALLER (OPTIONAL)
1. AUTO DIALLERS TO BE USED INCASE THE TEMPERATURE OF ANY FREEZER OR
COLD ROOM GOES ABOVE LIMIT. IT WOULD AUTOMATICALLY DIAL ON THE
MOBILE NO. OF LAB INCHARGE SO THAT HE CAN CHECK THE REQUIRED
FREEZER OR COLD ROOM

46
SUB MAIN DISTRIBUTION BOARD 1
1. CT’S TO BE PROVIDED FOR LOAD
MEASUREMENT
8. CABLES COLOUR CODE TO BE FOLLOWED
10. INDICATION LAMPS NOT WORKING
LIGHTING AND POWER DISTRIBUTION
BOARD 2
1. CABLES DRESSING & ARRANGEMENT TO BE
DONE PROPERLY
4. PHASE WIRES, NEUTRAL AND EARTH TAGGING
TO BE DONE WITH CIRCUIT NUMBERS
7. INTERNAL COVER AVAILABLE ONSITE BUT
REMOVED.
10. LIGHTS BREAKER TRIPPING DUE TO OVERLOAD
11. AC UNIT NOT WORKING. SUPPLY NEEDS TO BE
CHECKED

47
SPARE DISTRIBUTION BOARD 3
3. BREAKER/FUSE STOPPERS ON DIN RAIL TO
BE PROVIDED AS THE FUSE IS LOSE
6. BREAKERS TAGGING AND PANEL NAME
PLATE TO BE PROVIDED
1. ALL INDICATION LAMPS DAMAGED

48
LIGHTING AND POWER DISTRIBUTION
BOARD 5
1. INDICATION LAMPS TO BE REPLACED
DONE PROPERLY
5. PHASE WIRES, NEUTRAL AND EARTH TAGGING
TO BE DONE WITH CIRCUIT NUMBERS
REMOVED.
12. LIGHTS BREAKER IS TRIPPING DUE TO
OVERLOAD
TAGGING RECOMMENDATIONS FOR
SWITCHES,EARTH AND NEUTRAL

49
BE PROVIDED FOR
AUMATICALLY
LIGHTS INSTEAD OF
MANUALLY SWITCHING
ON/OFF BREAKER AND
SWITCH SHOULD BE
INSTALLED
3. WEATHER PROOF BOX IP65
RATED TO BE INSTALLED.AT
PRESENT ITS JEOPARDIZING
THE SAFETY STANDARD
CONDUCTOR COLOUR CODE
RECOMMENDATIONS

51
1. CT’S TO BE PROVIDED FOR LOAD
MEASUREMENT AS PRESENTLY ITS NOT
AVAILABLE
10. LUGS ARE NOT AS PER SIZE FOR FIRST AND
SECOND BREAKER

52
FOLLOWED FOR DISTRIBUTION BOARD
6. EXPOSED WIRES OF INDUSTRIAL SOCKET
OUTSIDE DB TO BE COVERED PROPERLY
7. LUGS NOT AS PER SIZE
8. FIRE ALARM PANEL SEPARATE BREAKER TO
BE PROVIDED
DONE PROPERLY
NUMBERS
REMOVED.

53
DISTRIBUTION BOARD 41. YELLOW INDICATION LAMP TO BE
PROVIDED
2. PANEL TO BE CLEANED PROPERLY
DONE PROPERLY
NUMBERS
REMOVED.

54
12. TWO CABLES SHOULD BE TERMINATED ON
SAME BREAKER AS ITS VIOLATION OF
STANDARDS.
13. 2 NUMBER DAMAGED EXHAUST FANS TO
BE REPLACED

55
DRY WARE HOUSE 2 DISTRIBUTION
BOARD 5
1. PANEL NAME PLATE TO BE
PROVIDED
2. BREAKER TAGGING TO BE
PROVIDED
PROVIDED
4. PANEL CLEANING TO BE DONE
5. INNER COVER PLATE TO BE
FIXED PROPERLY
6. SINGLE PHASE BREAKER
SHOULD NOT BE HUNG LOSE
BOARD 5
7. COLOUR CODE NOT FOLLOWED. BLACK
CABLE USED FROM BUS BAR TO BREAKER.
8. COLOUR CODE NOT FOLLOWED . WHITE
CABLE USED FROM BREAKER TO BREAKER
9. CABLES SHOULD BE WIRED FROM BUS
BAR TO BREAKER INSTEAD OF BREAKER
TO BREAKER
10. WIRES SHOULD BE ARRANGED PROPERLY

56
BOARD 5
11. INSULATION TAPE SHOULD NOT BE USED
FOR CABLE ARRANGEMENT
FIRST LEVEL LIGHTING AND POWER
SOCKETS FINAL DISTRIBUTION BOARD 6
NUMBERS
10. INNER COVER PLATE IS MISSING

57
1. OUTSIDE LIGHTS NOT WORKING
2. PHOTOVOLTIC CELL SHOULD BE
PROVIDED FOR AUMATICALLY
CONTROLLING THE OUTSIDE LIGHTS
INSTEAD OF MANUALLY SWITCHING
ON/OFF BREAKER AND WEATHER
PROOF MANUAL SWITCH SHOULD
BE INSTALLED.
3. LED LAMPS SHOULD BE USED FOR
ENERGY SAVING
4. WEATHER PROOF BOX IP65 RATED
TO BE USED AS ITS OUTSIDE
5. TERMINATION IS NOT OK AS
INSULATION SHOULD NOT BE
VISIBLE

59
FIRE ALARM SYSTEM DRY WARE
HOUSE
1. FIRE ALARM CABLES TO BE INSIDE GI
CONDUITS
2. FIRE ALARM SYSTEM IS NOT OPERATIONAL
IN DRY WARE AND COLD WARE HOUSE AS
ITS SOUNDING SO SWITCHED OFF BY
OPERATORS. FIRE ALARM PANEL SHOULD BE
ALWAYS FUNCTIONAL. SWITCHING IT OFF IS
VIOLATION OF STANDARDS .SMOKE
DETECTORS AND MANUAL CALL POINTS
NEED TO BE CHECKED AS ALARMS ARE
COMING AND NEEDED TO BE RECTIFIED.
3. IN DRY WARE HOUSE ALL EXHAUST FANS
ARE DAMAGED AND NOT WORKING.
EXHAUST FANS SHOULD BE INTERLOCKED
WITH FIRE ALARM SO THAT INCASE OF FIRE
ALL THE SMOKE SHOULD BE EXTRACTED
OUT
4. SPARES OF SMOKE DETECTORS AND
MANUAL CALL POINTS TO BE MAINTAINED
FIRE ALARM COLD WARE HOUSE 1
1. FIRE ALARM CABLES TO BE INSIDE GI
CONDUITS WHICH ARE EXPOSED
2. POWER CABLE SHOULD NOT BE EXPOSED
OUTSIDE
3. EXHAUST FANS SHOULD BE INTERLOCKED
WITH FIRE ALARM AS PER NFPA 72 SO
THAT IN CASE OF FIRE SMOKE SHOULD NOT
BE ACCUMULATED INSIDE WARE HOUSE

60
FIRE ALARM SYSTEM COLD AND DRY
WARE HOUSE
1. TAGGING FOR FIRE BELL ,SMOKE
DETECTORS TO BE DONE FOR
MAINTENANCE AND
PROGRAMMING PURPOSE

61
CLOSED CIRCUIT TV (CCTV)
SYSTEM:

62
CLOSED CIRCUIT TV (CCTV) SYSTEM
CONDUIT T-JOINT TO BE PROVIDED FOR POWER AND CCTV AT
ROOF TOP. CABLES SHOULD NOT BE EXPOSED TO DIRECT
SUNLIGHT
CLOSED CIRCUIT TV (CCTV) SYSTEM
JUNCTION BOX TO BE PROVIDED FOR CAMERA
EQUIPMENTS INSTEAD OF VHANGING
EQUIPMENTS ON WALL

64
EXIT GUIDE BOARDS WIRING
EXIT GUIDE BOARD WIRING TO BE INSIDE GI CONDUITS. IT
SHOULD NOT BE EXPOSED .
EXIT GUIDE BOARDS WIRES DRY AND
COLD WARE HOUSE
1. EXIT GUIDE POWER
SUPPLY ARE PLACED
LOSE ON GROUND. THE
CABLE AND POWER
SUPPLY SHOULD BE
INSIDE CONDUIT WITH A
SEPARATE JUNCTION BOX
AND BREAKER.

65
RECOMMENDATIONS FOR PANEL
BOARDS:

66
RECOMMENDATIONS FOR PANEL
LAYOUT

67
RECOMMENDATION FOR TAGGING OF
CIRCUIT WIRES AND RCD’S

68
RECOMMENDATION FOR CIRCUIT NO

69
RECOMMENDATIONS FOR WIRING
DESIGN

70
RECOMMENDATIONS FOR
EMERGENCY SHUTDOWN SWITCH
/ISOLATOR
ALL COLD ROOM TO BE PROVIDED
WITH OUTDOOR SHUTDOWN
SWITCH . AT PRESENT CR-05,
08,09,31,29,30,28 AND FZ-07 HAVE
NO EMERGENCY SHUTDOWN
SWITCH/ ISOLATER
LIGHTING CONTROL SYSTEM FOR DRY
AND COLD WARE HOUSES
1. OPTIONAL LIGHTING OCCUPANCY SENSORS WITH CONTROL SYSTEM SHOULD
BE INSTALLED AND SHOULD BE INTEGRATED TO EXISTING LIGHTING SYSTEM
FOR SAVING ELECTRICITY. THIS WOULD SENSE THE MOVEMENT INSIDE WARE
HOUSES AND SWITCH ON/OFF THE LIGHTS AS PER REQUIREMENT.

71
RECOMMENDATION FOR EXHAUST
FAN WITH DUCTS
1. EACH UNIT SHOULD BE INSTALLED WITH
EXHAUST DUCT TO REMOVE HEAT
GENERATED BY COLD UNITS

72
MAINTENANCE SCHEDULE
1. SPARE PARTS TO BE MAINTAINED FOR CONTACTORS , BREAKERS , COLD
UNITS REFRIGERATS AND ACCESSORIES
2. INSPECTIONS TO BE DONE AS PER ATTACHED SCHEDULE
3. CAT GENERATOR MAINTENANCE SCHEDULE PROVIDED SEPARATELY
4. CAT GENERATOR DAILY MAINTENANCE SCHEDULE PROVIDED SEPARATELY
.

77
7. Standards followed:
Low Voltage Switchgear and Switchboards:
Summary:
This annexure includes survey of following equipment according to the international standards
listed below:
1. Main Low Tension Panel.
2. Main and Sub-main Switchboards.
3. Automatic transfer switches
Reference International Standards:
1. IEC 61439-1
LV Switchgear & Control Gear Assemblies-- General rules
2. IEC 61439-2
LV Switchgear & Control Gear Assemblies - Power Switchgear and Control gear Assemblies
3. IEC 60947-1
LV Switchgear & Control Gear - General rules
4. IEC 60947-2
Circuit breakers
5. IEC 60898
Circuit breakers for over current protection (MCB)
12. IEC 60947-4
Contactors and motor starters(1 to 3 parts)
13. IEC60947-5
Control circuit devices and Switching elements (1 to 9 parts)
14. IEC 60947-6
Multiple function equipment - Transfer (1 to 2 parts) Switching, Control & protective switching
devices
15. IEC 60068
Environmental Testing

78
Reference for Best international Practice:
Electricity Wiring Regulations (Third Edition) The Regulation and Supervision Bureau for the
water, wastewater and electricity sector in the Emirate of Abu Dhabi (UAE).
General Observation:
General:
1. Generator maintenance logging form should be maintained. Generator spares, fuel filling
system to be provided
2. Distribution Board for substation should be installed.
3. Work Shop for testing should be separate. Substation should not be used for testing and
maintenance works.
4. The main low tension switch boards should be dust and vermin protected, front operated
and of clean appearance.
5. The switch boards should be made of folded EGI (Electro galvanized iron), also the
switchboard should be rust proof and epoxy polyester painted.
6. Enclosure should have removable rear cover panels to allow access to rear interior of
switchgear.
7. All exposed bolts or screw heads should be chrome or cadmium plated.
8. All doors and removable covers or plates should be provided with suitable neoprene
gaskets to prevent the ingress of dust, vermin and insects.
9. The switch boards should be of IP 54 construction in accordance with IEC 60529
switchboards.
10. The section construction should be so designed that sheet steel barriers shall be
provided between each vertical sections, breaker compartments, and control and power
compartments. Each compartment sheet walls should provide protection against direct
contacts with live parts and guarantee a degree of protection IP2X. The sections should
be of modular construction with its functional unit having its own door, mounting plates,
side partitions and horizontal partitions.
11. Adequate cable ways shall be provided in the switch board accessible by hinged lids or
removable covers.
12. Faulty indicating instruments should be replaced by new ones.
13. Gland plate for compartment with single core cable shall be made of aluminum. (To
avoid eddy currents)
14. All low-voltage switchboards must be a Type Tested Assembly (TTA), compliant with
IEC 61439· 1 and 2. The switchboard type-test certificates shall be originated by a
worldwide known third-party certification organization such as ASEFA ASTA or KEMA.
15. The switchboard should have the capability to withstand seismic conditions. The seismic
test should be done in compliance with the UBC (Uniform Building Code) and CBC
(California Building Code) regulations.

79
Bus bars:
1. All phase and neutral bus bars should extend throughout the length of the board with
the same cross section area. The currently installed bus bars comply with this
standard.
2. Bus bars should be housed in separate airtight compartment which should not
contain any wiring or apparatus other than that required for connection to bus bars.
Access to bus bars and bus bar connections should be gained only by removal of
covers secured by bolts or studs and internal shrouding plates at all sides. Bus
links/feeder links should be color coded for phase and neutral identification.
Circuit and Connections:
1. All outgoing circuits should have separate compartment and/or be screened so that
equipment for anyone circuit can be maintained without risk of contact with lives
connections on any other circuit.
2. All feeders should be provided with cable lugs and brass cable glands.
3. All wiring should be identified using ferrules at both ends.
4. Main Switch Board / Main Distribution Boards should be provided with Ammeters,
voltmeter and status indication lamps for phases.
Main and Sub main Switch boards:
1. The main and sub-main switch boards should be totally enclosed, dust protected and
factory fabricated suitable for operation on 415/240 V, 3 Phase, 4 wire, 50 Hz supply.
2. The main isolator should be a triple pole and neutral molded case circuit breaker with or
without tripping element conforming to IEC 61947.
3. The earth bus should have adequate rating and length for connecting the incoming and
outgoing earth wires or tapes.
4. High conductivity copper bars or rods covered by colored PVC sleeve or painted for
phase identification should be employed for all connections of 100A and higher. For
smaller connections suitable PVC insulated cables to B.S. 6231 should be used with
colored insulation for phase identification. However, currently there are no specifically
mentioned / labeled phases.
5. The arrangement of the boards should be such that the main isolator and MCCBs can
be operated when the door is open but to gain access to the MCCBs, cabling and
terminations a second cover should be removed. Adequate clearance should be
maintained between phases and there should be no crowding of wires in close proximity
of metal.
6. The boards should have cable glands for convenient terminations of incoming and
outgoing cables. However, cable glands were installed in some boards but were absent
in most of them.
M.C.B Distribution Boards:
1. MCB distribution boards should comprise of a totally enclosed dust and vermin protected
conforming to IP41 as per IEC 60529.
2. The circuit breakers should provide earth leakage protection for the lighting and power
sections.

80
3. The wiring between the circuit breakers and bus bars should be carried out with colored
suitably rated PVC insulated cables with copper conductors for phase identification.
Adequate clearance should be maintained between phase and non-current carrying
metals. Terminals should be so located that in the final connected positions there should
be no crowding of wires in close proximity of live metals.
4. Cable glands should be provided in every distribution board.
5. The MCB shall have thermal overload trip to accept 5% overload and to trip at 30% of
rated current as per IEC 60947-2.
6. Out goers on the MCB Distribution boards should be identified by labels affixed on front
of the board. Aligned with each device, Access to the inside of the enclosure for
maintenance purposes should be possible by removing the inner dead front/ cover.
7. The terminals of all components should be of the tunnel type (IP 20) in order to minimize
the risk of direct contact.
8. For cable running in the enclosure. Adequate clearance should be available on either
side of the outgoing breakers (gutter space).
9. All outgoing circuits including neutrals and earth should be labeled with labels/ferrules.
Properly segregate, support and label all cabling within the panels.
10. All boards should have waterproof gasket and circuit protective conductors between the
covers and the boards.
Contactors:
1. Contactors located within the boards do not require a separate enclosure but the
construction of the contactor should be such that it is not possible to come into contact
with live parts conforming to IP2X both on power and control circuit connections. The
already installed system has contactors according to required standards.
Power Supply Cables:
1. BS 6004: “Specification for PVC-Insulated Cables (non- armored) for + IEC 227 Electric
Power and Lighting”.
2. BS 6346: “Specification for PVC-Insulated Cables for Electricity Supply”.
3. BS 7671: “Requirements for Electrical Installations”.
General Observations:
1. They should be neatly fixed in straight lines. On cable trays, cables should be fixed by
cable clips and or on angle supports inside formed trenches. The spacing of cable
supports should be as indicated in the latest IEEE regulations. Cables on cable tray
when run exposed to open atmospheric condition should be covered with canopy on
cable tray.
2. Cables should be continuous from outlet to outlet and no joints should be made except
within outlet or junction boxes.

81
3. Each cable shall be labeled at both termination points and in each junction box, terminal
box and cabinet through which it passes.
4. All cables shall be so arranged and fixed that any one of the cables may be removed
without disturbance of the remainder.
5. The crossing over of cables on the same tray or in the same trench should be avoided
as far as possible. All unnecessary bends should be straightened after lying.
Cable in Conduits:
1. Cables should be installed without joints, all connections being made at switch positions,
lighting points, ceiling roses, etc.
2. Cables should be installed without kinks.
3. Cables forming sub-circuits connected to different distribution boards should not be run
in the same trenching or conduit.
4. Single phase final circuits should have phase wires colored red and neutral wires
colored black. The earth conductor should be green/yellow striped.
Conduits:
1. BS 4607: “Part 1 - Non-Metallic Conduits and Fittings for Electrical Installations: Rigid
PVC conduits and Fittings Metric Units”.
2. BS 4662: “Specification for Boxes for the Enclosure of Electrical Accessories”.
3. BS 6053: “Conduit Diameter and Threads for Conduit and Fittings” + IEC 423A
4. BS 6099: “Conduits for Electrical Installations”.
5. BS 7671: “Requirements for Electrical Installations”.
1. The pipes should be corrosion resistant and unaffected by water, oxidizing agents,
aggressive soils, and sand fungi growth, bacterial and electrolytic action. Contrary to
this, currently most of the pipes have corrosion and joints of wire are exposed through
these pipes which can prove fatal in case of emergency.
2. For future expansion in electrical system, Conduits shall be in accordance with BS 6099
Heavy Gauge (standard) and conduit fittings shall be in accordance with B.S. 4607 and
CEE Publication 26. The conduits and fittings shall be suitable for installation at
temperature -5 to +85° C and they shall not soften or suffer any degradation at these
temperatures. Conduits and fittings shall be of the self-extinguishing type.

82
Lightning Protection:
1. BS EN62305 (I-IV): 2006 - Standard for Lightning Protection
2. BS EN50164-1:2000: Lightning Protection Components
3. BS EN50164-2:2000: Part 2 - Requirements for Conductors and Earth Electrodes.
1. Materials used in the manufacture of the lightning protection system components should
comply with BS EN 50164. No combination of materials should be used to form an
electrolytic couple causing corrosion in the presence of moisture unless moisture is
permanently excluded from the junction of such materials. Where unusual conditions
exist which would cause corrosion of conductors, suitable protective coatings should be
used. Where mechanical hazard is involved, suitable protection should be provided by
enclosing or covering conductors in PVC conduits or other non-magnetic material.
2. Lightning protection system should be as per BS EN 62305 using copper conductors
and consisting of an air termination network, down conductors, test clamps, earth
termination and all other fixing materials and accessories.
3. Bond all exposed metalwork on the roof structure to form part of the air termination
network.
Grounding and Bonding:
1. The grounding and bonding system should be installed and it should include:
I. Earth Pits
II Earth Electrodes
III Copper Tape
IV Accessories
2. Generally, all non-current-carrying, metal components of the electrical installation and of
power-consuming equipment shall be connected to the earthing system.
3. The main earth bars shall be constructed of high conductivity copper, tape of size 25 x
3mm (minimum) to BS 1432.
4. The cross sectional area of protective conductors shall be in accordance with the
relevant IEC and BSI standards.
5. All earth continuity conductors should terminate finally at the building main switchboard
earth bus and extended from there to earth electrodes.
6. The earthing system of the building should be an independent system connected to the
earth bus on the main low tension switchboard. The neutral shall not be used for
earthing and shall be connected to the earth only at the main low tension switchboard.
7. The conduit system should be considered as continuous for earthing purposes only if the
conduit is rigid heavy gauge steel with threaded connections and lock nuts at all boxes
and all connections of the conduit system should be checked for good electrical

83
continuity. Where flexible connections are made to equipment, earthing jumpers should
be provided.
8. The earth wires should be covered with PVC.
9. All electrical equipment appliances, laboratory equipment in workshops, laboratories be
earthed to earth tape fixed to walls. The earth tape should be high conductivity copper
conductor neatly and firmly secured to the walls.
10. The earth tape shall be connected to the low tension switchboard earth bus.
11. All distribution boards should be provided with an earth bus or earth terminal and these
should be connected to the earth bus in the main switch-board by earth conductors
included with the feeders.
12. Connection between earth bars and equipment frames and stranded copper cables
should be made with appropriate compression lugs, bolts, nuts and lock washers.
Contact surfaces should be thoroughly cleaned and tinned or thermo welded
connections can be used.
13. Lugs, bolts, nuts, washers, screws, clamps, cleats and other items which come into
direct contact with copper earth bars, tapes, cables, etc. should be non-ferrous and
manufactured from brass, bronze or other suitable conducting material which will not
cause electrolytic corrosion.
14. Connection between copper and galvanized structures should additionally be tinned.
15. Earthing tapes shall be of continuous unbroken lengths.
16. If jointing becomes absolutely necessary, then, after obtaining approval of the Engineer‟s
Representative the tapes should be joined by fusion welding „Them weld‟ or similar
process.
17. The earth bus in the main switchboard should be connected to the panel room earth bus.
The panel room earth bus should be connected to the earthing points.
18. The maximum overall earth resistance between any point on the earth installation and
general mass of the earth should be less than 2 ohm.
19. The connection between earth conductors and earth rods should be made by means of
high strength corrosion resistant copper alloy connector clamps and brazed.
20. The tops of the electrodes should be protected from any damage and should be easily
accessible being enclosed in pits equipped with covers.
Capacitor Banks:
The capacitor banks should conform in design, material, construction and performance to the
latest editions of the IEC standards, their corresponding British/European (BS EN) or American
(ANSI, UL) standards and in particular to the following publications:
1. IEC 61921: Power capacitors – Low voltage power factor correction banks.
2. IEC 60831-1: Shunt power capacitors of the self-healing type for a.c. systems having a rated
voltage up to and including 1000V - Part I: General-Performance, testing and rating-Safety
requirements-Guide for installation and operation.

84
3. IEC 60831-2: Shunt power capacitors of the self-healing type for a.c. systems having a rated
voltage up to and including 1000V - Part 2: Ageing test, self-healing test and destruction test.
4. IEC 61439-1: Low-Voltage Switchgear and Control gear Assemblies – Part 1: General Rules
5. IEC 60076-6: Power transformers - Part 6: Reactors
6. IEC 60747-6 : Semi-conductor devices. Discrete devices. Part 6: Thyristors.
7. IEC 60085-1: Electrical insulation – Thermal evaluation and designation.
8. IEC 60664: Insulation coordination for equipment within low- voltage systems.
9. IEC 60947-1: Low-voltage switchgear and control gear - Part 1: General rules.
10. IEC 60947-2: Low-voltage switchgear and control gear - Part 2: Circuit breakers.
11. IEC 60947-3: Low-voltage switchgear and control gear-devices. Part 3: Switches,
disconnectors, switch- disconnectors and fuse combination units.
12. IEC 60947-4-1: Low-voltage switchgear and control gear – Part 4-1: Contactors and motor
starters.
13. IEC 60502-1: Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (Um=1.2kV) up to 30 KV (Um=36 kV) Part-1: Cables for rated voltages of 1 kV
(Um=1.2 kV) and 3KV (Um=3.6 kV).
14. IEC 60529: Degree of protection provided by enclosures (IP code).
15. UL 508A: Low voltage switched power factor correction banks assembly.
16. UL 810: Low voltage capacitors.
17. IEEE 519-1992: IEEE Recommended Practices and Requirements for Harmonic Control in
Electric Power Systems.
General observations / recommendations:
1. The capacitors banks, power factor controllers, power quality meters, switchgear and
other equipment must give continuous and trouble free service under the arduous
conditions. The electrical rooms wherein the capacitor banks are installed should have
suitable ventilation to ensure uninterrupted operation of these devices.
2. The capacitor units required for the different types of low voltage capacitor banks should
be self-healing type with individual discharge resistors and should be protected against
internal faults, over pressure, etc., and manufactured in full compliance with and tested
to the requirements of the International Electro-technical Commission Publication No.
IEC 60831, Part-1 and Part 2.

86
9. Proposed Drawings for Nine New Units:

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