CSLB C-10 Electrical ContractorPlanning and EstimatingEasy
An electrician is reviewing blueprints for a new commercial building. The general notes specify that all branch circuit conductors for 120V and 277V lighting are to be sized assuming a 3% voltage drop and a 75°C termination temperature. What section of the CEC provides general guidelines and requirements for conductor ampacity and temperature limitations?
- AArticle 430
- BArticle 240
- CArticle 310
- DArticle 220
Show answer & explanationAnswer & explanation
Correct answer: C. Article 310
CEC Article 310 covers conductors for general wiring, including ampacities, allowable operating temperatures, and various installation requirements. Article 220 is for load calculations, Article 240 for overcurrent protection, and Article 430 for motors.
Why the other options are wrong
- A. Incorrect. Article 430 covers motors, motor circuits, and controllers.
- B. Incorrect. Article 240 covers Overcurrent Protection.
- D. Incorrect. Article 220 is primarily for Branch-Circuit, Feeder, and Service Load Calculations.
CEC Article 310
The section of the California Electrical Code that provides general requirements for conductors used in electrical wiring, including their types, insulation, operating temperatures, and ampacity ratings.
- Contains tables for conductor ampacities (e.g., Table 310.16).
- Addresses correction factors for ambient temperature and number of current-carrying conductors.
- Specifies conductor marking requirements and uses.
Memory trick: Loads, Protection, Conductors, Motors - each has its own Code book.