NWSA Electrical Safety and Grounding

Question 1

What is the minimum safe approach distance for unqualified workers near energized overhead power lines rated up to 50kV?

Accepted Answer

10 feet

Answer

OSHA 1926.1408 requires unqualified workers to stay at least 10 feet away from energized overhead lines rated up to 50kV.

Question 2

Which OSHA construction standard specifically covers general electrical safety requirements for construction workers?

Accepted Answer

1926.416

Answer

OSHA 1926.416 establishes the general electrical safety requirements applicable to workers in the construction industry.

Question 3

What color identifies the equipment grounding conductor in standard US electrical wiring?

Accepted Answer

Green or bare copper

Answer

US wiring standards identify the equipment grounding conductor by green insulation or bare (uninsulated) copper.

Question 4

GFCI protection on construction sites is required for which type of power?

Accepted Answer

Temporary power distribution and portable electric tools

Answer

OSHA requires GFCI protection for all 120-volt, single-phase temporary power outlets and portable electric tools used at construction sites.

Question 5

The primary purpose of electrically bonding two metallic tower components together is to:

Accepted Answer

Equalize electrical potential and prevent arcing or shock

Answer

Bonding eliminates voltage differences between metallic components, preventing dangerous arcing, sparking, or electric shock hazards.

NWSA - National Wireless Safety Alliance Practice Test