Isolated ground receptacles are required to be identified by what marking on the face of the receptacle?

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

Answer: (A)

The main idea is to recognize when a receptacle has an isolated grounding path and needs to be clearly identified so electricians know not to bond its grounding conductor to the metal yoke. The standard marking for an isolated-ground receptacle is an orange triangle on the face. This orange triangle signals that the grounding terminal is isolated from the device’s metal strap and is intended to connect to a separate equipment grounding conductor back to the panel. This helps ensure proper noise reduction for sensitive electronics.

The other marks don’t convey the isolation requirement: a green marking is commonly associated with general grounding/b bonding, while a blue triangle or an orange circle aren’t the standard identifiers for isolated-ground receptacles.