Isolated ground receptacles are identified by what marking on their face?

• A. An Orange Triangle on the Face
• B. A Green Triangle on the Face
• C. An Orange Circle on the Face
• D. A Blue Triangle on the Face

Answer: (A)

Isolated-ground receptacles are designed to minimize electrical noise for sensitive equipment by using a separate grounding conductor that is isolated from the building’s normal grounding path. The telltale mark on the face is an orange triangle near the grounding terminal. This orange triangle signals that the receptacle’s ground is isolated and should connect to its own insulated grounding conductor back to the panel. Other color or shape markings aren’t the standard indicator for isolation, so they don’t convey this special grounding arrangement.