MASS Electrical Safety and Power Line Awareness 2

Question 1

What is the minimum clearance distance required from power lines when the voltage is UNKNOWN?

Accepted Answer

50 feet

Answer

OSHA requires a minimum 50-foot clearance when line voltage is unknown, ensuring the most conservative margin to cover the possibility of high-voltage conductors.

Question 2

Which OSHA standard specifically governs power line safety requirements for crane and derrick operations in construction?

Accepted Answer

29 CFR 1926.1408

Answer

OSHA 29 CFR 1926.1408 is the specific standard addressing power line safety procedures for crane and derrick operations in the construction industry.

Question 3

What is 'step potential' and why does it pose a hazard near an energized crane?

Accepted Answer

A voltage difference between two ground contact points that drives current through a person's legs and body

Answer

Step potential is the voltage difference between two points on the ground energized by a fault current; a person standing with feet apart creates a circuit through their body, causing electrocution.

Question 4

According to OSHA, if a power line cannot be de-energized before crane operations, what must the utility company provide?

Accepted Answer

Insulation of the lines or a written revised minimum approach distance based on actual voltage

Answer

When de-energization is not possible, OSHA requires the utility company to either physically insulate the lines or provide a written revised minimum approach distance based on the confirmed voltage.

Question 5

When operating a crane near power lines, OSHA requires that a specific person be assigned to what dedicated role?

Accepted Answer

A signal person assigned exclusively to monitor and maintain clearance from the power lines

Answer

OSHA requires a dedicated signal person (spotter) whose sole job is to monitor the crane's proximity to power lines and warn the operator when approaching the minimum clearance distance.

MASS Test Practice Test

MASS Test Practice Test

MASS Electrical Safety and Power Line Awareness 2