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 Quandaries | August 2008
Q. When adjusting the ampacity of a conductor due to conductor bundling, do we use the 90°C column ampacity or the 75°C column ampacity as listed in Table 310.16 for THHN?
Code Q&A
Q. Is the required working space for a panel measured from the panel guts inside the panel or from the panel cover?
Code Q&A
Q. What are the requirements when installing a 120V switch in the same box with a 277V switch?
Code Q&A
Q. Can I use 14 AWG conductor pigtails from a 12 AWG, 20A circuit so that I can backstab the wires to the receptacle?
Code Q&A
Q. I have a building that has two services from the utility. Do I have to use the same grounding system for both?
Code Quandaries
Q. Can I connect the neutral conductor to the equipment-grounding terminal at both the transformer and the first disconnect?
Article 600: Electric Signs and Outline Lighting 1
Every commercial occupancy needs a form of identification, the standard method of which is typically the electric sign. This is one reason why you'll be working with Art. 600 if you do much commercial or industrial work.
Code Q&A
Q. Can the lights in a dwelling unit bathroom be on the same circuit as the bathroom receptacles?
Code Q&A
Q. Can a 2-pole snap switch be used to switch a 277V and 120V circuit?
Code Quandaries
What are the requirements for installing isolated ground receptacles?
Article 450: Transformers and Transformer Vaults 1
The operation of any facility depends on power distribution, which, in turn, depends on transformers. Safe and reliable operation of transformers is crucial
Code Q&A
Q. I was told that a back-fed breaker needs to be bolted into the panel. Is this correct?
Code Q&A
Q. Does the NEC require a connection of a parking lot lighting pole to a ground rod?
Code Quandaries
Q. What size THHN conductor is required for a 320A 3-phase feeder load for commercial office buildings?
Article 424: Fixed Electric Space Heating
Considering the fact that it has nine parts, at first glance, Art. 424 might seem like overkill for a device as simple as a heater. Walk into any hardware
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