AEP Code Compliance & Standards 2

Question 1

Under NFPA 70E, what is the minimum approach boundary within which an arc flash hazard exists and PPE is required?

Accepted Answer

Arc flash boundary

Answer

The arc flash boundary is the distance at which a worker could receive a second-degree burn from an arc flash event and requires appropriate PPE.

Question 2

Which ANSI/IEEE standard covers the design and performance of power distribution switchgear rated above 1000V?

Accepted Answer

ANSI C37.20.2

Answer

ANSI C37.20.2 covers metal-clad switchgear for voltages above 1000V, defining construction and performance requirements.

Question 3

According to OSHA 29 CFR 1910.269, what is required before an employee works on energized electrical equipment?

Accepted Answer

An energized electrical work permit

Answer

OSHA 1910.269 and NFPA 70E both require an energized electrical work permit when work must be performed on or near energized conductors.

Question 4

What does the term 'interrupting rating' refer to in the context of electrical overcurrent protective devices?

Accepted Answer

The maximum fault current the device can safely interrupt

Answer

Interrupting rating (short-circuit current rating) is the maximum fault current a protective device can interrupt without damage or hazard.

Question 5

Under NEC Article 250, what is the primary purpose of equipment grounding conductors (EGC)?

Accepted Answer

To provide a low-impedance path for fault current to operate overcurrent protection

Answer

Equipment grounding conductors provide a low-impedance fault current path that enables overcurrent devices to operate and clear the fault quickly.

(AEP) American Electric Power Practice Test