Lineman Safety Regulations and Compliance 4

Question 1

According to the NESC, what is the required minimum vertical clearance for a 7,200-volt distribution line over a public road?

Accepted Answer

18 feet

Answer

The NESC requires a minimum of 18 feet of vertical clearance above roadway surfaces for distribution lines up to 22 kV serving roads accessible to trucks.

Question 2

What condition must exist before a lineman may use barehand (live-line) work methods on a high-voltage transmission line?

Accepted Answer

The worker must be at the same electrical potential as the conductor and bonded to it

Answer

Barehand technique requires the lineman to be bonded to and at the same potential as the energized conductor, eliminating voltage difference across the body.

Question 3

Under OSHA 1910.269, which of the following is a specific requirement before a crew begins work on a de-energized overhead line?

Accepted Answer

Visually inspect the line for any back-feed sources and verify de-energization with a live-line tester

Answer

Workers must verify that the line is de-energized using test equipment and identify all possible energy sources, including back-feed from customer generation, before proceeding.

Question 4

A lineman receives an electrical contact injury but is still conscious. What should be the FIRST action by the crew?

Accepted Answer

Remove the victim from the hazard without touching them directly if the circuit is still energized, or shut off power first

Answer

Rescuer safety is paramount—the circuit must be de-energized or the victim must be freed using insulating tools before direct contact is made.

Question 5

What is the purpose of the two-person rule required by OSHA for certain high-voltage tasks?

Accepted Answer

To ensure a second qualified worker is present who can de-energize the circuit and provide first aid if the primary worker is incapacitated

Answer

OSHA 1910.269(a)(2)(iii) requires at least two workers when exposure to voltages of 50 V or more exists, so rescue action can be taken immediately.

(Lineman) Lineman Certification Practice Test

(Lineman) Lineman Certification Practice Test

Lineman Safety Regulations and Compliance 4