Working Near Electrified Lines Flashcards

When must a worker handling long metallic tools (e.g., rail bars) be especially cautious near overhead electrified lines?

Answer: When the tool could bridge the gap between earth and the live conductor

Long metallic tools can act as conductors and bridge the distance between earth and a live overhead wire, causing electrocution.

What color is typically used to identify the overhead catenary wire on electrified rail systems in the US?

Answer: Bare copper or aluminum wire (no color coding — position identifies it)

Overhead catenary wires are typically bare copper or aluminum and are identified by their position above the track, not by color coding.

A worker sees a colleague accidentally contact a live electrified rail and fall. What should the worker do FIRST?

Answer: Call for help and ensure the power is isolated before approaching

Approaching a victim in contact with live current without isolation risks a second electrocution — you must call for help and wait for power to be cut first.

Which type of glove provides protection when handling equipment in areas where incidental contact with electrified components is possible?

Answer: Rubber insulating gloves rated for the voltage level

Rubber insulating gloves rated for the specific voltage level are required to provide protection against electrical shock.

What is the significance of the 'approach distance' versus the 'no-go zone' in electrified rail safety?

Answer: The approach distance requires caution; the no-go zone prohibits entry without isolation

The approach distance is a caution zone requiring awareness and precautions, while the no-go zone is a hard boundary that cannot be entered without electrical isolation.

How should a worker respond if their vehicle or machine makes contact with an overhead electrified line?

Answer: Stay inside the vehicle and call for help unless fire forces exit

Staying inside a vehicle that contacts an overhead line is safer because the vehicle acts as a Faraday cage — exiting creates a path for current through your body to ground.

Which safety document must be in place before any planned work begins on or near electrified infrastructure?

Answer: A Permit to Work or equivalent electrical safe system of work

A Permit to Work or formal electrical safe system of work must be in place before any work near electrified infrastructure, ensuring all hazards are controlled.