CEP Safety Standards & Compliance 3

Question 1

According to OSHA 1910.333, what is the minimum approach distance for unqualified workers near exposed energized parts at 50V to 300V?

Accepted Answer

They must avoid contact but no specific distance is mandated

Answer

OSHA 1910.333 states unqualified workers must avoid contact with exposed energized parts at 50–300V; a minimum approach distance applies only to higher voltages for unqualified workers.

Question 2

What is the purpose of an Equipment Grounding Conductor (EGC) in a branch circuit?

Accepted Answer

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

Answer

The EGC provides a low-impedance return path for fault current so that overcurrent protective devices operate quickly to clear the fault.

Question 3

Under NEC Article 210.8, GFCI protection is required for 125V, 15A and 20A receptacles in which of the following locations?

Accepted Answer

In bathrooms, garages, outdoors, crawl spaces, unfinished basements, kitchens, and boathouses

Answer

NEC 210.8 mandates GFCI protection in numerous specific locations including bathrooms, garages, outdoors, crawl spaces, unfinished basements, kitchens, and boathouses.

Question 4

Which arc flash boundary is defined as the distance at which an unprotected worker would receive a second-degree burn if an arc flash incident occurs?

Accepted Answer

Arc flash boundary

Answer

The arc flash boundary is the distance at which incident energy equals 1.2 cal/cm², the threshold for a just-curable second-degree burn.

Question 5

A facility has 480V switchgear with an available fault current of 65,000A. What critical characteristic must overcurrent protective devices in this equipment possess?

Accepted Answer

A sufficient interrupting rating equal to or greater than 65,000A

Answer

Per NEC 110.9, overcurrent protective devices must have an interrupting rating sufficient for the available fault current at their point of installation.

(CEP) Certified Electrical Professional Practice Test

(CEP) Certified Electrical Professional Practice Test

CEP Safety Standards & Compliance 3