Arc flash thermal energy is proportional to a. V times I. b. I^2 R. c. V divided

Question

Arc flash thermal energy is proportional to a. V times I. b. I^2 R. c. V divided I d. I^2 t. The National Electrical code and the standard for Electrical Safety in the Workplace are published by the a. Institute of Electrical and Electronics Engineers (EEE) b. National Fire Protection Association (NFPA) c. National Electrical Manufacturers Association (NEMA) d. National Society of Professional Engineers (NSPE) If the black (120V) wire and white (neutral) wire supplying a receptacle are interchanged, which of the following will be the case? a. The receptacle will not work. b. It makes no difference because the source is AC. c. The grounding of the receptacle will not work. d. The receptacle will work, but the incorrect polarity could pose a shock hazard and is a violation of the National Electrical Code.

Explanation / Answer

8 f) Arc flash thermal energy is proportional to V*I

Since E = 1/2( Iarc*V arcTarc / Darc)

8 g) National Fire Protection Association (NFPA)

8) h) Option (d) because the circuit will stil be potentially energized.even when the electrical device is switched off.

  

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