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. Can I terminate two wires on a single-pole circuit breaker? A. Yes, if the terminal is identified for two conductors, either within the equipment instructions or on the terminal itself. It’s my understanding that only Square D circuit breakers (15A, ...
Code Quandaries
Stumped by the Code?
Grounding vs Bonding — Part 5 of 12
Do you know the right way to ground and bond buildings or structures supplied by feeders or branch circuits?
Code Q&A
Q. Does the Code limit the total ampere rating of all circuit breakers in a panel? For example, could the total ampere rating of all circuit breakers in a 100A panel exceed 100A? A. This isn’t a Code issue. The sum of the ampere rating of the circuit ...
Code Q&A
Q. What’s the maximum number of circuit breakers permitted to be installed in a panel? A. The maximum number of circuit breakers permitted in a panelboard is limited by the instructions posted inside the panelboard . In addition, 408.15 specifies that a ...
Grounding vs Bonding — Part 4 of 12
People often forget that all transformers, except autotransformers, are separately derived
Code Q&A
Q. What outlets in a dwelling unit are required to be AFCI protected? A. All 15A or 20A, 120V branch circuits that supply outlets in dwelling unit bedrooms must be protected by a listed AFCI device . According to Art. 100, an outlet is a point in the ...
Code Q&A
Q. Must metal siding and metal framing members be grounded? A. The NEC doesn’t specifically require metal siding or metal framing members to be bonded (not grounded) to an effective ground-fault current path . However, exposed structural metal that ...
Grounding vs Bonding — Part 3 of 12 1
Grounding and bonding at service equipment
Code Quandaries 1
Q. What is the maximum number of 15A or 20A, 125V receptacle outlets permitted on a 20A, 120V general-purpose branch circuit in a commercial occupancy?
Code Q&A
Q. I’ve been looking online, but I can’t seem to find a consistent answer on whether a television antenna placed in the attic needs to be grounded. Does it? A. No. Each lead-in conductor from an outdoor antenna must be provided with a listed antenna ...
Code Q&A
Q. Can a 15A or 20A, 125V receptacle on an elevated dwelling unit porch serve as the required outdoor receptacle outlet? A. No. According to 210.52(E), one 15A or 20A, 125V receptacle outlet is required at the front and back of a dwelling unit. Such ...
Grounding vs Bonding — Part 2 of 12
General requirements for grounding and bonding differ
Code Quandaries
Stumped by the Code?
Code Q&A
Q. Can service drop conductors be supported by trees? A. It all depends on who installed the conductors. If the installation is under the exclusive control of the utility, then this isn’t a violation of the NEC. However, it might be a violation of the ...

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