NFPA70 Study Guide Exam 2025
Questions and Answers
What is an Arc Flash? - ANSWER✔✔-A short circuit that jumps through the air from one exposed
conductor to another.
What makes an Ar Flash dangerous? - 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? - ANSWER✔✔-hardhat, safety
glasses, hearing protection, heavy duty leather gloves, leather work shoes.
What proper electrical PPE protect you from? - ANSWER✔✔-burns, electrical shock and small
shrapnel.
What is PPE? - 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? - ANSWER✔✔-50 - 600V
What is the most important part of creating an electrically safe work condition - ANSWER✔✔-Test
for Voltage
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, Once an electrically safe work condition is created, shock and arc flash protection are no longer
necessary. (T/F) - 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). - ANSWER✔✔-False
When dressing in layers for arc flash protection, non-FR material can be counted toward your total
level of protection. (T/F). - ANSWER✔✔-False
When dressing in layers for arc flash protection, non-FR material can be counted toward your total
level of protection. (T/F). - ANSWER✔✔-False
Crossing the _________ ___________ ___________ is the equivalent of performing live work. -
ANSWER✔✔-Prohibited Approach Boundary
For energized circuits, escorted unqualified persons are allowed within which Hazard Protection
Approach Boundaries? - 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? -
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). - ANSWER✔✔-True
What is the time in which a GFCI is required to open a circuit in the event of a fault? -
ANSWER✔✔-1/40th of a second
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
Questions and Answers
What is an Arc Flash? - ANSWER✔✔-A short circuit that jumps through the air from one exposed
conductor to another.
What makes an Ar Flash dangerous? - 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? - ANSWER✔✔-hardhat, safety
glasses, hearing protection, heavy duty leather gloves, leather work shoes.
What proper electrical PPE protect you from? - ANSWER✔✔-burns, electrical shock and small
shrapnel.
What is PPE? - 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? - ANSWER✔✔-50 - 600V
What is the most important part of creating an electrically safe work condition - ANSWER✔✔-Test
for Voltage
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, Once an electrically safe work condition is created, shock and arc flash protection are no longer
necessary. (T/F) - 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). - ANSWER✔✔-False
When dressing in layers for arc flash protection, non-FR material can be counted toward your total
level of protection. (T/F). - ANSWER✔✔-False
When dressing in layers for arc flash protection, non-FR material can be counted toward your total
level of protection. (T/F). - ANSWER✔✔-False
Crossing the _________ ___________ ___________ is the equivalent of performing live work. -
ANSWER✔✔-Prohibited Approach Boundary
For energized circuits, escorted unqualified persons are allowed within which Hazard Protection
Approach Boundaries? - 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? -
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). - ANSWER✔✔-True
What is the time in which a GFCI is required to open a circuit in the event of a fault? -
ANSWER✔✔-1/40th of a second
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
