Licensed Electrical Contractor Licensed Electrical Contractor OSHA Safety Standards Questions and Answers 2

Question 1

Under OSHA 29 CFR 1926.405, what is the maximum allowable length for a temporary power cord on a construction site before a ground-fault circuit interrupter (GFCI) is required?

Accepted Answer

There is no length limit; GFCIs are always required for temporary wiring

Answer

OSHA requires GFCI protection on all 120-volt, single-phase, 15- and 20-ampere temporary wiring used on construction sites regardless of cord length.

Question 2

According to OSHA's electrical safety standards, what is the minimum approach distance for a qualified electrical worker near exposed energized parts operating at 601 to 750 volts?

Accepted Answer

2 feet 2 inches

Answer

OSHA Table S-5 in 29 CFR 1910.333 specifies a minimum approach distance of 2 feet 2 inches for voltages ranging from 601 to 750 volts.

Question 3

What does OSHA require an employer to do before employees work on deenergized electrical equipment?

Accepted Answer

Implement lockout/tagout procedures per 29 CFR 1910.147

Answer

OSHA mandates lockout/tagout procedures under 29 CFR 1910.147 to ensure equipment is properly deenergized and cannot be accidentally reenergized.

Question 4

Under OSHA 29 CFR 1926.416, which of the following is a required safety practice when working near overhead power lines on a construction site?

Accepted Answer

All equipment must maintain at least 10 feet of clearance from lines up to 50 kV

Answer

OSHA requires a minimum clearance of 10 feet from overhead power lines energized at up to 50 kV, with additional clearance for higher voltages.

Question 5

According to OSHA, what color must the grounding conductor insulation be in a fixed electrical installation?

Accepted Answer

Green or green with yellow stripes

Answer

OSHA and the National Electrical Code require equipment grounding conductors to be identified by green insulation or green with one or more yellow stripes.

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Licensed Electrical Contractor Licensed Electrical Contractor OSHA Safety Standards Questions and Answers 2