An equal-potential work zone is intended to ensure what condition among exposed conductors?

• A. All exposed conductors are at the same electrical potential
• B. All exposed conductors are isolated from ground
• C. Only neutral conductors are energized
• D. There is no potential difference anywhere

Answer: (A)

An equal-potential work zone is about making all exposed conductors in the zone share the same electrical potential. When bonded and grounded to a common reference, these surfaces have no voltage difference between them. Because current only flows when there’s a potential difference, a worker touching or working on those conductors won’t have current pass through them, which reduces shock and arc-flash risk.

Practically, this is achieved by tying exposed conductive surfaces together with bonding jumpers and grounding paths, using equipotential mats or barriers as needed, and employing appropriate insulating tools and procedures to maintain the same potential across touched surfaces. Remember, it’s not that there’s no voltage anywhere in the system; it’s that the exposed conductors within the work zone are at the same potential, so no dangerous current can flow through a person who connects between two points in that zone.

The other ideas—isolating from ground, energizing only neutral conductors, or claiming there is no potential difference anywhere—don’t provide the same safety guarantee for the worker.