Mike Holt

NEC Trainer / Consultant,
Mike Holt Enterprises

Mike earned a masters degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Since 1975, he has provided custom in-house seminars for groups such as IAEI, NECA, ICBO, IBM, AT&T, Motorola, and the U.S. Navy. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to develop seminars, videos, books, and software as well as contributing monthly Code content to EC&M magazine.

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 ...
Stumped by the Code?
Q. Can I ground a satellite system to the metal parts of electrical equipment?
Article 810: Radio and Television Equipment
Article 810 provides installation requirements for transmitter and receiver equipment as well as the associated wiring and cabling (Fig. 1). Article 810
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 1
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 ...
Code Q&A
Q. Can Table 310.15(B)(6) be used to size service conductors to a duplex, where there is no firewall separating the units? A. No. Table 310.15(B)(6) only allows a reduced-size service and feeder conductors for individual dwelling units of one-family, ...
The Ins and Outs of Optical Fiber Cable Installation
Several factors are driving the popularity of optical fiber cabling. Chief among those is the growth of high-tech applications that require the massive
Stumped by the Code?
Q. Do I need to use hospital-grade receptacles in a chiropractor's or medical examining room?
Code Q&A
Q. What are the limitations on the use of rigid nonmetallic conduit in an underground application serving a gasoline dispenser?
Code Q&A
Q. Can Table 310.15(B)(6) (reduced size wire for dwelling unit service) be used to size the service neutral conductor for a single-family dwelling?

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