Red Seal Electrician Practice
Safety and work practicesQuestion 272 of 1506

An electrician wants to give a guarantee of isolation for a panel that is fed from a source controlled by someone else. What must happen first?

  1. Open the panel main switch, then lock it out and tag it
  2. Ask the utility for the load data on the feeder circuit
  3. Get a guarantee for the source from whoever controls it
  4. Place a safety ground on the feeder before anything else
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Correct answer: Get a guarantee for the source from whoever controls it

Isolation of the source must be guaranteed by the person who controls the source.

Source: Canada Occupational Health and Safety Regulations (SOR/86-304), Canada Occupational Health and Safety Regulations (SOR/86-304), Part VIII: Electrical Safety

Practice safety and work practices

Questions last reviewed: 18 October 2026