Stumped by the Code?
Q. Is it legal to make a mechanical transition from electrical metallic tubing (EMT) to flexible metal conduit with a fitting that joins these two raceways instead of installing a box?
Branch Circuits - Part One
Article 210 contains the requirements for conductor sizing, conductor identification, overcurrent protection, and GFCI and AFCI protection of branch circuits.
Code Q&A
Q. Can a circuit breaker be used to switch fluorescent lighting? A. Yes, but the circuit breakers must be listed and marked SWD or HID. High-intensity discharge (HID) lighting can be switched only by circuit breakers marked HID . ...
Code Q&A
Q. I’m running a 4-wire lighting circuit with a shared neutral. Can I use three single-pole breakers without handle ties? A. Yes. Individual single-pole breakers can be installed on each ungrounded conductor of a multiwire branch circuit that supplies ...
Stumped by the Code?
All questions and answers are based on the 2005 NEC. Q. Does the Code require bonding around raceway knockouts for 277V or 480V feeders and branch circuits?
Code Q&A
Q. If the secondary conductors of a transformer are less than 10 feet in length, do the secondary conductors have to terminate in a main breaker? A. You can run secondary conductors up to 10 feet without overcurrent protection, if they comply with ...
Code Q&A
Q. Does the Code require bonding around raceway knockouts for 120V, 208V, or 240V feeders and branch circuits? A. You must bond all metal parts intended to serve as the effective ground-fault current path, such as raceways, cables, equipment, and ...
Top 50 NEC Rules
Aluminum grounding conductors cannot be in contact with earth, masonry, or subjected to corrosive conditions. When used outdoors, the termination to the electrode must not be within 18 inches of earth. Where exposed, grounding electrode conductors ...
Code Q&A
Q. How do I size the circuit conductors and protection device for a 25-hp, 208V, 3-phase fire pump design letter B motor if not supplied by an on-site generator? A. The fire pump motor circuit overcurrent protective device must be sized to carry ...
Code Q&A
Q. What are the NEC requirements for using electrical metallic tubing (EMT) to physically protect NM cable? A. For one, a nonmetallic bushing or adapter must be installed at the point where the cable enters the raceway . In unfinished basements, the ...
Article 800: Communications Circuits
Because Art. 800 has its roots in telephone technology, it addresses telephone and related systems that use twisted-pair wiring. The telephone utility
Code Q&A
Q. Can I install a panel in a residential bathroom? What about in a bedroom? A. The NEC does not permit overcurrent protection devices to be located in the bathrooms of dwelling units, or guestrooms/guest suites of hotels or motels . However, nothing in ...
