Power Supplies for Electric Motor Driven Fire Pumps

Fire Pump Power Supplies Applicable Codes and Intent - for - F.M. Approvals - by - James S. Nasby Columbia Engineering

Topics to be Covered Are: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Applicable Standards ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NFPA 20 – Standard for the Installation of Stationary Pumps for Fire Protection ,[object Object],* * Note: The NEC TCC rejected updating extract text from NFPA-20-2007. Thus the 2008 NEC retained the wording from NFPA-20-2003. A task group is looking into this situation.

What is Covered by NEC Article 695 ,[object Object],[object Object],[object Object],695.1(A) Power Sources Control Circuits Control Equipment Fire Pump

What Is Not Covered By Article 695 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],695.1(B)

How Is Article 695 Applied? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],90.3 & 695.2

What Is the Intent . . . of Article 695 -and- NFPA-20 ,[object Object],[object Object],NFPA 20 and 695.3 Reliable and Sacrificial

2 - Power Source(s) for Electric Motor Drive Fire Pumps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Philosophy Power Sources for Electric Motor Driven Fire Pumps ,[object Object],[object Object],[object Object],[object Object],[object Object]

Permitted Types of Power Sources for Electric Motor Driven Fire Pumps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],695.3

Number of Reliable Electric Power Sources Required ,[object Object],[object Object],[object Object],[object Object],[object Object]

A Reliable Electric Power Source . . . ,[object Object],[object Object],[object Object],[object Object],[object Object]

What Are Individual Power Source(s)? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],695.3(A)

Separate Service as an Individual Power Source. ,[object Object],[object Object],[object Object]

Each Individual Power Source ,[object Object],[object Object],[object Object],[object Object]

Separate Service From a Utility Normal Service Fire Pump Service Sufficiently Remote Locations

Power Supply Arrangement ,[object Object],[object Object]

Tap Ahead of the Building Service ,[object Object],[object Object],[object Object],695.3(A)(1) & 695.6(D)

On-site Power Production Facility ,[object Object],[object Object],[object Object],[object Object],695.3(A)(2)

Multiple Power Sources - When Needed ,[object Object],[object Object],[object Object],695.3(B)

Multiple Power Sources - NFPA 20 ,[object Object],[object Object],[object Object],[object Object]

Multiple Power Sources -- Other Electric Power Sources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples of Multiple Power Sources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples of Multiple Power Sources NFPA-20 Section 9.2, Power Sources ,[object Object],Fire Pump Controller Service #1 Service #2 M Fire Pump Motor

Examples of Multiple Power Sources NFPA-20 Section 9.2, Power Sources ,[object Object],M Service On-site standby Generator G Fire Pump Controller

Examples of Multiple Power Sources NFPA-20 Section 9.2, Power Sources ,[object Object],[object Object],Service #2 Service #1 High Voltage Substation Feeders Fire Pump Controller M

Examples of Multiple Power Sources NFPA-20 Section 9.2, Power Sources ,[object Object],[object Object],On-site Standby Generator Service Feeders Fire Pump Controller M High Voltage Substation G

Examples of Multiple Power Sources NFPA-20 9.2, Power Sources (Tap Ahead . . .) ,[object Object],[object Object],Service Feeders Fire Pump Controller M Plant Power Disconnect

Multiple Power Sources - On-site Generator ,[object Object],[object Object],[object Object],[object Object]

Multiple Power Sources -- On-site Generator ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multiple Power Sources -- Transfer of Power ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Arrangement I Controller - Xfer. Switch Combination ,[object Object],[object Object],[object Object],[object Object]

Arrangement II Transfer Switch Ahead of Controller ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multiple Power Sources - Summary ,[object Object],[object Object],[object Object],[object Object],695.3(B)

Power Supply Performance – Any and All Sources ,[object Object],[object Object],[object Object]

Maximum Allowed Voltages Drops – Motor Starting ,[object Object],[object Object],[object Object],[object Object],695.7

Maximum Allowed Voltages Drops – Motor Running ,[object Object],[object Object],[object Object],[object Object],[object Object],695.7

3 - Continuity of Power ,[object Object],[object Object],[object Object],[object Object],[object Object],695.4

Physical Protection of Electric Power Supplies ,[object Object],[object Object],[object Object]

Physical Protection of Power Supplies (Cont.) ,[object Object],[object Object]

Continuity of Power ,[object Object],[object Object],[object Object]

Methods of Achieving Continuity ,[object Object],[object Object],695.4

Direct Connection of Supply Conductors ,[object Object],[object Object],[object Object],695.4(A)

Supervised (Indirect) Connection ,[object Object],[object Object],[object Object],[object Object]

Supervised (Indirect) Connection – cont’d ,[object Object],695.4(B) *Service Entrance Rated (Listed) Fusible Disconnect or Enclosed Circuit Breaker FIRE PUMP CONTROLLER FIRE PUMP X SERVICE POINT SERVICE DISCONNECTING MEANS* M

The Disconnecting Means . . . ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Overcurrent Protection . . . ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Means of Supervision of Disconnect ,[object Object],[object Object],[object Object],[object Object]

Additional Disconnect Requirements ,[object Object],[object Object],[object Object],[object Object],695.4(B)

4 - Transformers for Fire Pump Circuits ,[object Object],695.5

Transformers for Fire Pump Circuits ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Power Supply Arrangement 'A' & 'B' for Normal Source Note: Transformer in Arrangement 'B' is optional

Transformers for Fire Pump Circuits ,[object Object],[object Object],[object Object],695.5

Transformer Dedicated to Fire Pump 695.5

Transformer Sizing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],695.5(A) Note: *125% is almost always too small to meet the two voltage drop requirements.

Transformer Overcurrent Protection ,[object Object],[object Object],695.5(B)

Transformer Overcurrent Protection ,[object Object],[object Object],[object Object],[object Object],695.5(B)

Power Supply Component and Wiring -- Code References ,[object Object],[object Object],[object Object],[object Object],[object Object]

5 - Power Wiring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Power Wiring (The Supply Conductors) Shall Be . . . ,[object Object],[object Object],[object Object],[object Object],695.6

Power Wiring-Circuit Conductors on Load Side of Disconnect and Overcurrent Protection-Within the Building ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Listed Electrical Circuit Protective Systems ,[object Object],[object Object],695.6(B)

Electrical Circuit Protective System May Consist of a . . . ,[object Object],[object Object],[object Object],[object Object]

Section 695.6(B) Exception - Electric and Fire Pump Rooms ,[object Object],[object Object],[object Object],695.6(B) Exc.

Wiring Methods for Power Circuits – Within the Pump Room ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],695.6(E)

Fire Pump Controller ,[object Object],[object Object],[object Object],695.6(F)

Fire Pump Controller Jockey Pump Controller and Separate Junction Box 695.6(F)

Junction Box Required when… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Junction Box Required when… ,[object Object],[object Object]

Fine Stranded Wire (Cable) Warning ,[object Object],[object Object],[object Object],[object Object],[object Object]

6 - Other Requirements ,[object Object],[object Object],[object Object],[object Object]

External Fire Pump Control Circuits (Remote Start, Deluge Valve Start, etc.) ,[object Object],[object Object],[object Object],695.14(A)

Prohibited Sensors & Control Devices ,[object Object],[object Object],[object Object],[object Object],695.14(b) & (c)

Wiring Methods for Control Circuits ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],695.14(E)

Specify Sequencing of Multiple Pumps when . . . ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

7 – Rough Rules of Thumb ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

8 - Fault Current Considerations ,[object Object],[object Object],[object Object],[object Object],10.1.2.2

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8 - Fault Current Considerations - cont'd

What’s Wrong with These Pictures? Severe Lightning Strike takes out Utility Arrester in a Very Lightning Prone Area. Also Damages Xfmr (Pot), Requiring Replacement; but, No Damage to Controller! Some Time Later on a Car Hits Another Pole Down the Alley and Causes a High Line (2.3 Kv) Cross to the Neutral which Takes Out Most of the Pump Room Loads and Damages one of the 3 CPTs in Controller.

Back in Service in Minutes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Power Supplies for Electric Motor Driven Fire Pumps

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