What is the first step in verifying that a conductor is in an electrically safe working condition?

What is the first step in verifying that a conductor is in an electrically safe working condition?

• A. Determine all possible sources of electrical supply by examining electrical one-line drawings, schematics, control drawings or any ID Tag
• B. Stop running equipment and then open all disconnecting devices for each source of electrical supply
• C. Ground the phase conductors
• D. Visually verify disconnecting device is fully open in the disconnected position

Answer: (A)

Identifying every potential source of electrical energy before doing any work is the essential starting point for having an electrically safe working condition. By reviewing one-line drawings, schematics, control diagrams, and any ID tags, you create a complete picture of all power paths that could energize the equipment—including main supplies, backup feeds, control power, and anything that could backfeed or re-energize the circuit. Knowing all sources is what makes proper isolation, lockout/tagout, and verification possible and effective. Simply stopping equipment and opening disconnects without confirming all energy sources could leave some sources alive. Grounding phase conductors is a later step after you’ve de-energized and verified zero energy, and visually confirming a disconnect is open does not guarantee that no other sources remain energized. Identifying all sources sets the stage for safe de-energization and subsequent zero-energy verification.

Identifying every potential source of electrical energy before doing any work is the essential starting point for having an electrically safe working condition. By reviewing one-line drawings, schematics, control diagrams, and any ID tags, you create a complete picture of all power paths that could energize the equipment—including main supplies, backup feeds, control power, and anything that could backfeed or re-energize the circuit. Knowing all sources is what makes proper isolation, lockout/tagout, and verification possible and effective.

Simply stopping equipment and opening disconnects without confirming all energy sources could leave some sources alive. Grounding phase conductors is a later step after you’ve de-energized and verified zero energy, and visually confirming a disconnect is open does not guarantee that no other sources remain energized. Identifying all sources sets the stage for safe de-energization and subsequent zero-energy verification.