AEP Code Compliance & Standards 3

Question 1

When performing lockout/tagout under OSHA 29 CFR 1910.147, after isolation and lockout, what is the required next step before beginning work?

Accepted Answer

Verify zero energy state by testing for absent voltage

Answer

After lockout, the worker must verify the zero-energy state by attempting to start or test the equipment and confirming absence of voltage.

Question 2

According to NFPA 70E Table 130.5(C), which task is likely to require the highest incident energy PPE level?

Accepted Answer

Racking in a medium-voltage circuit breaker with the door open

Answer

Racking in medium-voltage circuit breakers with open doors exposes workers to the highest arc flash potential, requiring the highest PPE level.

Question 3

Under NEC Article 110.9, overcurrent protective devices must have an interrupting rating sufficient for the available:

Accepted Answer

Short-circuit current at the point of installation

Answer

NEC 110.9 requires that devices have an interrupting rating equal to or greater than the available short-circuit current at the point of installation.

Question 4

Which IEEE standard defines the requirements for transformer protection and the settings for differential relays on large power transformers?

Accepted Answer

IEEE C37.91

Answer

IEEE C37.91 provides guide for protective relay applications to power transformers, including differential relay settings and considerations.

Question 5

In electrical safety, what does 'flash hazard analysis' determine according to NFPA 70E?

Accepted Answer

The incident energy level and required PPE for a specific work task

Answer

Flash hazard analysis calculates the incident energy at a work location to determine required PPE category and arc flash boundary.

(AEP) American Electric Power Practice Test

(AEP) American Electric Power Practice Test

AEP Code Compliance & Standards 3