E2 Safety Standards and Practices 2

Question 1

What is the minimum approach distance for qualified workers near energized 480V conductors without PPE barriers?

Accepted Answer

Restricted approach boundary

Answer

The restricted approach boundary defines the closest distance a qualified worker may approach energized conductors without additional protection measures.

Question 2

Under OSHA 29 CFR 1910.333, de-energized electrical equipment must be locked out before work begins unless the employer can demonstrate that de-energizing would:

Accepted Answer

Cause a greater hazard or is infeasible due to equipment design

Answer

OSHA allows energized work only when de-energizing creates a greater hazard or is infeasible due to equipment design or operational limitations.

Question 3

Which NFPA 70E hazard/risk category requires an arc flash suit with a minimum arc rating of 40 cal/cm²?

Accepted Answer

Category 4

Answer

NFPA 70E Category 4 (now referred to in the PPE table) requires a minimum arc rating of 40 cal/cm² for protection against higher-energy arc flash incidents.

Question 4

When inspecting a commercial switchboard, an inspector notices an arc flash label that is over 5 years old. According to NFPA 70E, this label should be:

Accepted Answer

Updated through a new arc flash hazard analysis

Answer

NFPA 70E requires arc flash hazard analyses to be reviewed at intervals not to exceed 5 years, necessitating an updated label.

Question 5

A commercial building's electrical panel room has a working space depth of 2.5 feet in front of a 480V switchboard. According to NEC 110.26, this is:

Accepted Answer

A violation; minimum depth is 3 feet for voltages 151–600V

Answer

NEC 110.26(A)(1) requires a minimum working space depth of 3 feet for systems 151–600V (Condition 1).

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Safety Standards and Practices 2