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Arc Flash Hazard Calculations – What does it all mean? Robert E. Fuhr, P.E. PowerStudies.com
Why are Arc Flash Hazard Studies Needed? ,[object Object],[object Object],[object Object]
 
 
OSHA Requirements ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object]
Key References in NEC ® -2008 ,[object Object]
NEC 110.16  (continued) ,[object Object]
Key References in NEC ® -2005 ,[object Object]
NFPA 70E -Flash Hazard Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Industry standards and regulations: ,[object Object],[object Object],[object Object]
Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object]
Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Acceptable & Informative Labels
NFPA 70E Table 130.7(C)(11)
Short Circuit Fault Study Coordination (PDC) Study Arc Flash Study Device Operating Time Arcing  Fault Current 3 Phase Bolted Fault Current Arc Flash Label Energy Level Boundaries Required PPE Obtain Equipment Nameplate Data  & Settings
Arc Flash Energy Calculation ,[object Object],[object Object],[object Object],[object Object]
Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object]
Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Arc Flash Hazard Analysis Key Steps ,[object Object]
How a Short Circuit Study is Performed ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How a Short Circuit Study is Performed ,[object Object],[object Object],[object Object]
What is Protective Device Coordination (PDC) Study? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Goal #1 - Maximum Selective Coordination Between Equipment ,[object Object],[object Object],[object Object]
Selective Coordination 1 2 3
Goal #2 - Maximum Equipment Protection and Reduction in Arc Flash Energy ,[object Object],[object Object]
Maximum Equipment Protection ,[object Object],1 1 1
[object Object]
PDC Vocabulary ,[object Object],[object Object],[object Object]
PDC Vocabulary  ,[object Object],[object Object]
 
Fuse TCC 3-6 Sec  5   kA @15   kA This Fuse is Current Limiting – Clearing time is 0.004 seconds
 
Thermal Magnetic Trip Unit ,[object Object],[object Object],[object Object],[object Object]
Thermal Magnetic Breaker 20   kA 0.01-0.025 Sec  4   kA 20-50 Sec
 
 
Solid State Trip Unit ,[object Object],[object Object],[object Object],Current Sensors Rating Plugs Current Setting
Solid State Trip Unit ,[object Object],[object Object],Long Time Pickup (LTPU) Long Time Delay (LTD) Short Time Pickup (STPU) Short Time Delay (STD) Instantaneous (I) Short Time  Delay I2T-IN  (I2T)
Solid State Trip ,[object Object],[object Object],[object Object],100   kA 0.01-0.06 Sec  6   kA 0.08-0.12 Sec  30   kA 170-210 Sec
Time Current Curves   ,[object Object],Current in Amperes X 100
Arc Flash Energy Calculations ,[object Object],[object Object],[object Object],[object Object]
Typical Assumptions for an Analysis ,[object Object],[object Object],[object Object]
Current Vs Energy Levels
Time Vs Energy Levels
Distance Vs Energy Levels
Arc Flash Warning Labels ,[object Object]
Limited Approach Boundary:   ,[object Object],[object Object],[object Object],[object Object]
Restricted Approach Boundary ,[object Object],[object Object]
Restricted Approach Boundary ,[object Object],[object Object]
Prohibited Approach Boundary ,[object Object],[object Object],[object Object],[object Object]
 
 
Arc Flash Label Installation ,[object Object],[object Object]
Arc Flash Label Installation ,[object Object],[object Object]
Line Side vs Bus AF Labels
Need more Information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Your Report
Thank you for your time! ,[object Object]

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Arc Flash Calculations What Does It All Mean