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.

Code Q&A
Q. In our local high school science lab, receptacles have been installed within 4 in. from the edge of a sink. Is this acceptable per the Code?
Code Q&A
Q. Where does the Code address which way the grounding terminal of a receptacle goes (up or down)?
How Much Working Space Is Enough? 3
In order to create safe working conditions, OSHA and the NEC provide working space requirements that vary according to the hazards involved with
Stumped by the Code? 5
Q. What are the NEC requirements on the use of the white wire for the ungrounded conductor?
Code Q&A
Q. Can a junction box contain both 277V and 120V conductors?
Code Q&A
Q. We had a new swimming pool installed at our house, and the electricians ran a cable to the pool equipment room panel. Is this legal?
Stumped by the Code? 1
Q. Is GFCI protection required for receptacles above the counter of a break room in an office building?
Code Q&A 1
Q. Can a 45 kVA transformer be installed in the ceiling space above the ceiling grid?
Code Q&A
Q. What is the maximum height that a safety switch can be installed?
Box Fill Calculations 8
Box fill isn't just the number of wires in the box — it's the total volume of the conductors, devices, and fittings in a box.
Code Q&A
Q. How do you size the ground wire when running conductors in parallel?
Code Q&A
Q. Our utility requires a nonfused disconnect upstream of the meter and service disconnect for certain services. Is this legal?
Sizing Junction Boxes 18
The sizing requirements for pull boxes, junction boxes, handhole enclosures, and conduit bodies exist to prevent conductor insulation damage. Those requirements
Code Quandaries
Q. I have a 1,200A, 480V panel that has a working space of 3½ feet. The engineer says 7 feet is required. Is he correct?
Code Q&A
Q. We have motors that are interlocked, preventing them from being on at the same time. Do we still have to add them up for service and feeder calculations?
Electrical Testing Feed
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