MASS Electrical Safety and Power Line Awareness 1

Question 1

According to OSHA 29 CFR 1926.1408, what is the minimum clearance distance required between a crane and overhead power lines rated up to 350kV during operations?

Accepted Answer

20 feet

Answer

OSHA 29 CFR 1926.1408 requires a minimum 20-foot clearance from power lines rated up to 350kV during crane and derrick operations.

Question 2

If a crane becomes energized after contacting a power line and the operator CANNOT move the equipment free, what is the correct action?

Accepted Answer

Remain in the cab and warn all ground personnel to stay away

Answer

When equipment is energized and cannot be freed, the operator must stay in the cab and warn others to stay clear until the utility company de-energizes the line.

Question 3

Before beginning crane operations near overhead power lines, who is responsible for determining the voltage of those lines?

Accepted Answer

The employer or lift director

Answer

OSHA places the legal responsibility on the employer to identify overhead power line hazards, including determining voltage, before operations begin.

Question 4

What is the primary purpose of an electrical proximity warning device (EPD) mounted on a crane?

Accepted Answer

To alert the operator when approaching the minimum clearance distance from energized power lines

Answer

Electrical proximity warning devices provide audible and/or visual alerts to crane operators as they approach the minimum safe clearance distance from energized conductors.

Question 5

What document or confirmation must be obtained from the utility company before a crane may operate inside the minimum approach distance to power lines?

Accepted Answer

Written confirmation that lines have been de-energized, grounded, or insulated

Answer

OSHA requires written confirmation from the utility that lines are de-energized and grounded, or physically insulated, before any crane work is permitted inside the minimum clearance.

MASS Test Practice Test

MASS Test Practice Test

MASS Electrical Safety and Power Line Awareness 1