PTS Working Near Electrified Lines 2

Question 1

What is the term used for the voltage that can pass through the ground from a downed electrified rail or wire, creating a hazard over a wide area?

Accepted Answer

Step potential

Answer

Step potential is the voltage difference between two points on the ground surface, which can cause current to flow through a person's legs.

Question 2

When working near a 750V DC electrified third rail, what is the minimum approach distance a worker must maintain without protective equipment?

Accepted Answer

12 inches

Answer

A minimum approach distance of 12 inches is generally required from a 750V DC third rail without special protective equipment.

Question 3

Which condition makes working near electrified lines MORE dangerous than usual?

Accepted Answer

Wet or humid conditions

Answer

Wet or humid conditions lower the resistance of materials and the human body, increasing the risk of electrical shock.

Question 4

A train is approaching while a worker is within the electrified zone. What is the FIRST priority?

Accepted Answer

Move to a place of safety immediately

Answer

Personal safety is always the first priority — the worker must immediately move to a designated place of safety before the train arrives.

Question 5

What does 'bonding' a section of track mean in the context of electrified railway work?

Accepted Answer

Electrically connecting components to equalize potential and reduce shock risk

Answer

Bonding equalizes electrical potential between conductive components, reducing the risk of dangerous voltage differences during work.

PTS - Personal Track Safety Practice Test