CSLB C-10 Electrical ContractorPlanning and EstimatingEasy
An electrical contractor is reviewing blueprints for a new commercial office building. The blueprints indicate a symbol that is a square with a diagonal line from one corner to the opposite, with the letter 'R' inside. What does this symbol typically represent?
- ASpecial purpose receptacle
- BFloor box receptacle
- CRecessed light fixture
- DDuplex receptacle, switched
Show answer & explanationAnswer & explanation
Correct answer: C. Recessed light fixture
A square with a diagonal line and the letter 'R' typically represents a recessed light fixture on electrical blueprints, indicating its mounting type and function.
Why the other options are wrong
- A. A special purpose receptacle often uses a standard receptacle symbol with a subscript (e.g., 'WP' for weatherproof) or a note.
- B. A floor box receptacle is usually indicated by a circle with 'F' or 'FB' and sometimes a receptacle symbol inside.
- D. A duplex receptacle, switched, typically uses a standard receptacle symbol with a line connecting to a switch symbol.
Architectural Electrical Symbols
Standardized graphical representations used on blueprints to depict electrical components, devices, and systems.
- Symbols provide a universal language for electricians and designers.
- Understanding symbols is crucial for accurate material takeoffs and installation.
- Variations exist, but many core symbols are widely recognized, often defined in a legend.
Memory trick: Lighting symbols: 'Shapes' and 'Letters' tell you 'Where' and 'What'.