Safety Trained Supervisor (STS) Practice Exam

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What does the term 'de-energize' refer to?

  1. Calibrating electrical equipment

  2. Disconnecting equipment from electric sources

  3. Charging batteries

  4. Testing electrical circuits

The correct answer is: Disconnecting equipment from electric sources

The term 'de-energize' specifically refers to the process of disconnecting equipment from its electric sources. In terms of safety practices, de-energizing is a critical step taken prior to maintenance or repair work on electrical equipment to ensure that there is no risk of electric shock or equipment malfunction. By removing the power supply, workers are significantly reducing the dangers associated with electrical hazards. This understanding is vital in the context of workplace safety, as it aligns with the protocols established to maintain a safe working environment when dealing with electrical systems. The other options relate to electrical work but do not capture the essence of what de-energizing entails. For example, calibrating equipment involves adjusting it for accuracy, charging batteries pertains to replenishing their stored energy, and testing circuits involves measuring and checking their functionality—all of which do not indicate the removal of electric sources.

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