CSLB C-10 Electrical ContractorPlanning and EstimatingEasy
A blueprint for a small commercial tenant improvement shows a symbol for a duplex receptacle with a small 'G' inside a triangle next to it. What does this symbol indicate?
- AGeneral-purpose receptacle
- BGround fault circuit interrupter (GFCI) receptacle
- CGenerator connection point
- DGrounding electrode conductor connection
Show answer & explanationAnswer & explanation
Correct answer: B. Ground fault circuit interrupter (GFCI) receptacle
In electrical blueprints, a triangle with a 'G' or 'GF' inside it, next to a receptacle symbol, is the standard representation for a Ground-Fault Circuit Interrupter (GFCI) protected receptacle. This indicates that the receptacle provides protection against ground faults.
Why the other options are wrong
- A. Incorrect. A standard duplex receptacle is typically just a circle with two diagonal lines; no 'G' in a triangle.
- C. Incorrect. A generator connection point would have a distinct symbol, possibly involving a generator schematic or a specific type of disconnect.
- D. Incorrect. A grounding electrode conductor connection would be part of a grounding system detail, not typically marked with this symbol on a receptacle.
GFCI Receptacle Symbol
A standard electrical blueprint symbol, typically a receptacle icon with an adjacent triangle containing a 'G' or 'GF', indicating a Ground-Fault Circuit Interrupter protected receptacle.
- GFCI receptacles provide personnel protection against electric shock.
- Required in specific locations like bathrooms, kitchens, outdoors, and garages (CEC 210.8).
- The symbol is critical for proper material takeoffs and installation planning.
Memory trick: Receptacle's mark tells its special function.