Safety and work practicesQuestion 273 of 1506

What must an employee do before attaching a safety ground to electrical equipment?

  1. Wait ten minutes after opening the switch
  2. Test the equipment to show it is isolated
  3. Measure the ground rod resistance first
  4. Ask the employer to sign the tag first
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Correct answer: Test the equipment to show it is isolated

Attaching a ground to live equipment is very dangerous, so isolation must be proven first.

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