Red Seal Electrician Practice
Safety and work practicesQuestion 592 of 1506

A worker stands on a rubber mat made for live work. What must be true for the mat to protect the worker?

  1. It is clean and dry.
  2. It is thicker than the worker's shoe soles are long.
  3. It is placed under a wet floor to keep moisture out.
  4. It is connected to the grounded conductor.
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Correct answer: It is clean and dry.

Moisture, dirt or sweat salts on or in insulating gear lower its resistance.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.3: Shock Current Path

Practice safety and work practices

Questions last reviewed: 18 October 2026