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NFPA 70E Questions and Answers
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- For exposed 480 VAC energized conductors and using NFPA 70E Table 130.2(C) or the Shock Protection Boundaries and PPE Fermilab Summary table for NFPA 70E, the Restricted Approach Boundary for shock protection is
a. 1 Inch
b. 7 Inches
c. 1 Foot
d. 3 Feet 6 Inches ✔✔c
- For energized circuits, escorted unqualified persons are allowed within which Shock Protection Approach Boundaries?
a. Restricted Approach Boundary
b. Limited and Restricted Approach Boundaries
c. Limited Approach Boundary
d. Prohibited Approach Boundary ✔✔c
- 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?
a. Requirements associated with Shock Protection Boundaries must be followed
b. Requirements associated with the Flash Protection Boundary must be followed
c. NFPA 70E does not require a written Energized Electrical Work Permit for performing LOTO voltage verification testing
d. All of the above apply ✔✔d
- Voltmeter testing of a 480 VAC 3 Phase Circuit to verify that the circuit is OFF typically involves
a. 3 measurements of phase to phase voltage
b. 3 measurements of phase to ground voltage
c. 3 measurements of phase to neutral voltage
d. All of the above measurements are necessary ✔✔d
a. Understand and protect yourself from the shock hazard
b. Understand and protect yourself from the arc-flash hazard
c. Both a. and b.
d. Get the work done in the allotted time ✔✔c
- A person who has received electrical safety training, has skills and knowledge related to the construction and operation of electrical equipment or a specific work method, and can recognize and avoid the electrical hazards that might be present with respect to that equipment or work method is
a. Everyone at Fermilab, home of the world's finest particle accelerator
b. A knowledgeable person
c. A qualified person
d. A supervisor ✔✔c
- You are an electrician accessing an energized 120/208 VAC panelboard to install a circuit breaker. The circuit is fed from a transformer less that 125 kVA. According to Simplified Guidance for Electrical Work on Fermilab AC Power Distribution Equipment, the minimum indicated Hazard/Risk Category is
a. 3
b. 0
c. 1
d. 2 ✔✔b
- In calculating your exposure to a potential arc-flash, determining factors as to the level of Arc-Rated clothing and PPE that you must wear is/are dependent on
a. The available fault current
b. Your distance from the potential arc-flash
c. The duration of the arc-flash
d. Only a. and b.
e. a., b. and c. are all determining factors ✔✔e
- When working under a Hazard/Risk Category of 2 or 2*, the minimum Arc-Rating of the FR clothing that you wear must be at least
a. 1.2 cal/cm
- The threshold incident-energy level for a second degree burn for a 1 second exposure is:
a. 1.2 cal/cm
b. 4 cal/cm
c. 8 cal/cm
d. 25 cal/cm2 ✔✔a
