PTS Working Near Electrified Lines 5

Question 1

A worker needs to cross over a live electrified third rail. What is the correct method?

Accepted Answer

Use an approved insulated crossing board placed over the rail

Answer

An approved insulated crossing board must be placed over the third rail to provide a safe, non-conductive path across it.

Question 2

What is the purpose of a 'short circuit device' applied to an isolated section of electrified track?

Accepted Answer

To provide a visible and functional earth that protects against accidental re-energization

Answer

A short circuit device provides both a visible indicator and a functional earth connection, ensuring that any accidental re-energization trips protection systems immediately.

Question 3

At what voltage does the US National Electrical Safety Code classify overhead transmission lines as 'high voltage' requiring strict clearance protocols?

Accepted Answer

Above 600V

Answer

NESC generally classifies lines above 600V as high voltage, requiring strict minimum approach distances and additional safety protocols.

Question 4

Which of the following is NOT a valid method for confirming electrical isolation before beginning work?

Accepted Answer

Assuming isolation because no train is scheduled for the next hour

Answer

Assuming isolation based on train schedules is never acceptable — formal confirmation through authorized channels and physical verification is always required.

Question 5

Why must workers avoid touching two conductive objects simultaneously when working near electrified infrastructure?

Accepted Answer

A worker can become part of a circuit if the objects are at different potentials, causing electrocution

Answer

Simultaneously touching two objects at different electrical potentials completes a circuit through the worker's body, allowing potentially fatal current to flow.

PTS - Personal Track Safety Practice Test

PTS - Personal Track Safety Practice Test

PTS Working Near Electrified Lines 5