E2 Safety Standards and Practices 3

Question 1

Which standard governs electrical safety in the workplace for general industry, separate from construction sites?

Accepted Answer

OSHA 29 CFR 1910 Subpart S

Answer

OSHA 29 CFR 1910 Subpart S covers electrical safety in general industry workplaces, while 1926 Subpart K applies to construction.

Question 2

A commercial electrical inspector finds a 600A, 480V panelboard installed in a boiler room with ambient temperatures regularly reaching 45°C. What is the primary concern?

Accepted Answer

Overcurrent devices are rated at 40°C; derating is required above that temperature

Answer

Most overcurrent protective devices are rated at 40°C ambient; sustained higher temperatures require derating per manufacturer specifications and NEC guidelines.

Question 3

Under NFPA 70E, an electrically safe work condition is verified by which sequence of steps?

Accepted Answer

De-energize, lockout/tagout, test for absence of voltage, apply grounds if needed

Answer

NFPA 70E 120.5 requires de-energizing, applying LOTO, then testing for absence of voltage before establishing an electrically safe work condition.

Question 4

An inspector notices a commercial generator transfer switch with no bonding jumper between the generator neutral and the grounding electrode system. This violates which NEC section?

Accepted Answer

NEC 250.30 for separately derived systems

Answer

NEC 250.30 requires that a separately derived system, such as a generator, have a system bonding jumper and be connected to a grounding electrode.

Question 5

A commercial site uses a qualified person to perform energized electrical work. NFPA 70E requires this person to have documented training in which areas at minimum?

Accepted Answer

Skills and techniques to distinguish exposed live parts, work on or near exposed live parts, and PPE selection

Answer

NFPA 70E defines a qualified person as one trained in skills to distinguish live parts, work safely near them, and properly select and use PPE.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Safety Standards and Practices 3