NFPA 70 TEST QUESTIONS AND ANSWERS
What is an Arc Flash? - ANSWER A short circuit that arcs through the air
between two exposed conductors.
Why is an Ar Flash dangerous? - ANSWER As much as 35k' F temperatures,
shrapnel, molten metal, chocks, shockwave (2k lbs/foot^2), soud (140 dB), burn
injuries.
Hazard/Risk Category 1 requires to wear PPE. What is it? - ANSWER hard hat,
safety glasses, hearing protectors, heavy leather gloves, working leather shoes.
What good electrical PPE protects you from? - ANSWER burns, electrical
shock and minor shrapnel.
What is PPE? - ANSWER Personal Protective Equipment
If you are qualified to work on low-voltage equipment, when do you no longer
perform electrical work at a higher voltage? - ANSWER 50 - 600V
What is the one most critical element of creating an electrically safe working
condition - ANSWER Test for Voltage
After a work condition that is electrically safe has been created, shock
protection and arc flash protection must no longer be provided. (T/F) -
ANSWER True
The Arc Flash Protection Boundary is the zone around an arc source where an
unprotected worker will receive first-degree burns. (T/F). - ANSWER False
Wearing layers of protection from arc flash can include non-FR material in your
overall level of protection. (T/F). - ANSWER False
, When wearing in layers for arc flash protection, non-FR material can be
included in your overall level of protection. (T/F). - ANSWER False
Entering the _________ ___________ ___________ is the same as doing live
work. - ANSWER Prohibited Approach Boundary
Escorted unqualified individuals are permitted in energized circuits within
which Hazard Protection Approach Boundaries? - ANSWER Limited
Approach Boundary
If a de-energized but not tested electric circuit that is typically over 50 volts has
been de-energized but not tested to ensure the circuit is in an electrically safe
work condition, which of the following are relevant? - ANSWER Flash
protection boundary requirements must be met.
Only licensed individuals will perform work such as testing and voltage
measurement in the restricted approach boundary of live electrical conductors
operating at 50 volts or more or where an electrical hazard exists. (T/F).
- ANSWER True
How long does it take a GFCI to open a circuit in the event of a fault? -
ANSWER 1/40th of a second
Which Hazard Risk Category requires a minimum of 25 calories/cm^2 arc-rated
clothing protection?
- ANSWER Category III
What electrical Hazards are NOT covered by NFPA 70E?
- ANSWER Lightning strikes
Hazard Risk Category Two requires at least a 40 cal/cm^2 Arc Rated Clothing.
(T/F)
- ANSWER False
What is an Arc Flash? - ANSWER A short circuit that arcs through the air
between two exposed conductors.
Why is an Ar Flash dangerous? - ANSWER As much as 35k' F temperatures,
shrapnel, molten metal, chocks, shockwave (2k lbs/foot^2), soud (140 dB), burn
injuries.
Hazard/Risk Category 1 requires to wear PPE. What is it? - ANSWER hard hat,
safety glasses, hearing protectors, heavy leather gloves, working leather shoes.
What good electrical PPE protects you from? - ANSWER burns, electrical
shock and minor shrapnel.
What is PPE? - ANSWER Personal Protective Equipment
If you are qualified to work on low-voltage equipment, when do you no longer
perform electrical work at a higher voltage? - ANSWER 50 - 600V
What is the one most critical element of creating an electrically safe working
condition - ANSWER Test for Voltage
After a work condition that is electrically safe has been created, shock
protection and arc flash protection must no longer be provided. (T/F) -
ANSWER True
The Arc Flash Protection Boundary is the zone around an arc source where an
unprotected worker will receive first-degree burns. (T/F). - ANSWER False
Wearing layers of protection from arc flash can include non-FR material in your
overall level of protection. (T/F). - ANSWER False
, When wearing in layers for arc flash protection, non-FR material can be
included in your overall level of protection. (T/F). - ANSWER False
Entering the _________ ___________ ___________ is the same as doing live
work. - ANSWER Prohibited Approach Boundary
Escorted unqualified individuals are permitted in energized circuits within
which Hazard Protection Approach Boundaries? - ANSWER Limited
Approach Boundary
If a de-energized but not tested electric circuit that is typically over 50 volts has
been de-energized but not tested to ensure the circuit is in an electrically safe
work condition, which of the following are relevant? - ANSWER Flash
protection boundary requirements must be met.
Only licensed individuals will perform work such as testing and voltage
measurement in the restricted approach boundary of live electrical conductors
operating at 50 volts or more or where an electrical hazard exists. (T/F).
- ANSWER True
How long does it take a GFCI to open a circuit in the event of a fault? -
ANSWER 1/40th of a second
Which Hazard Risk Category requires a minimum of 25 calories/cm^2 arc-rated
clothing protection?
- ANSWER Category III
What electrical Hazards are NOT covered by NFPA 70E?
- ANSWER Lightning strikes
Hazard Risk Category Two requires at least a 40 cal/cm^2 Arc Rated Clothing.
(T/F)
- ANSWER False
