CSLB C-10 Electrical ContractorPlanning and EstimatingEasy
A client has provided blueprints for a new commercial warehouse. The electrical plans indicate a symbol consisting of a triangle with the letter 'P' inside, and an arrow pointing away from one side. What does this symbol typically represent?
- APush button station
- BPanelboard
- CPower factor correction capacitor
- DPhotoelectric cell
Show answer & explanationAnswer & explanation
Correct answer: D. Photoelectric cell
On electrical blueprints, a triangle with the letter 'P' inside and an arrow pointing away typically represents a photoelectric cell, which is used for automatic lighting control based on ambient light levels.
Why the other options are wrong
- A. A push button station is usually represented by a circle with a single line or dot inside.
- B. A panelboard is commonly indicated by a rectangular box with internal lines or numbers.
- C. A power factor correction capacitor has a distinct symbol, often two parallel lines with a 'C'.
Control Device Symbols
Standardized graphical representations used on blueprints to depict automatic or manual devices that control electrical circuits or equipment.
- Symbols for control devices help identify their function and location.
- Understanding these symbols is essential for proper installation and troubleshooting.
- The legend on blueprints provides specific interpretations for symbols used.
Memory trick: Control symbols: 'Shapes' and 'Arrows' tell you 'How' it controls.