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NFPA70 Study Guide Exam Questions & Answers
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What is an Arc Flash? - SOLVED ANSWER-A short circuit that jumps through the air from one exposed conductor to another. What makes an Ar Flash dangerous? - SOLVED ANSWER-Temperatures of up to 35k' F, shrapnel, molten metal, chocks, shockwave (2k lbs/foot^2), soud (140 dB), burn injuries. Haza...

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  • August 19, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • nfpa70 study guide exam questions answers
  • nfpa70 study guide exam questions answers stuvia
  • what is an arc flash solved answer a short cir

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NFPA70 Study Guide Exam Questions &
Answers

What is an Arc Flash? - SOLVED ANSWER-A short circuit that jumps through the air
from one exposed conductor to another.



What makes an Ar Flash dangerous? - SOLVED ANSWER-Temperatures of up to 35k'
F, shrapnel, molten metal, chocks, shockwave (2k lbs/foot^2), soud (140 dB), burn
injuries.



Hazard/Risk Category 1 contains PPE requirements. What are they? - SOLVED
ANSWER-hardhat, safety glasses, hearing protection, heavy duty leather gloves,
leather work shoes.



What proper electrical PPE protect you from? - SOLVED ANSWER-burns, electrical
shock and small shrapnel.



What is PPE? - SOLVED ANSWER-Personal Protective Equipment



If you are qualified to work on low-voltage equipment, what is the cut-off point where
you are not allowed to perform electrical tasks at higher voltages? - SOLVED
ANSWER-50 - 600V



What is the most important part of creating an electrically safe work condition - SOLVED
ANSWER-Test for Voltage



Once an electrically safe work condition is created, shock and arc flash protection are
no longer necessary. (T/F) - SOLVED ANSWER-True



The Arc Flash Protection Boundary is the distance from an arc source where an
unprotected worker will receive first-degree burns. (T/F). - SOLVED ANSWER-False

, When dressing in layers for arc flash protection, non-FR material can be counted toward
your total level of protection. (T/F). - SOLVED ANSWER-False



When dressing in layers for arc flash protection, non-FR material can be counted toward
your total level of protection. (T/F). - SOLVED ANSWER-False



Crossing the _________ ___________ ___________ is the equivalent of performing
live work. - SOLVED ANSWER-Prohibited Approach Boundary



For energized circuits, escorted unqualified persons are allowed within which Hazard
Protection Approach Boundaries? - SOLVED ANSWER-Limited Approach Boundary



If an electrical circuit that normally operates above 50 volts has been de-energized but
not tested to verify that the circuit is in an electrically safe work condition, which of the
following apply? - SOLVED ANSWER-Requirements associated with flash protection
boundary must be followed.



Only qualified persons shall perform tasks such as testing and voltage measuring within
the limited approach boundary of energized electrical conductors operating at 50 volts
or more or where an electrical hazard exists. (T/F). - SOLVED ANSWER-True



What is the time in which a GFCI is required to open a circuit in the event of a fault? -
SOLVED ANSWER-1/40th of a second



Which Hazard Risk Category requires clothing that provides a minimum of 25
calories/cm^2 arc-rated protection? - SOLVED ANSWER-Category III



What electrial Hazards are NOT covered in NFPA 70E? - SOLVED ANSWER-Lightning
strikes



Hazard Risk Category Two requires a minimum of a 40 cal/cm^2 Arc Rated Clothing.
(T/F) - SOLVED ANSWER-False

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