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.

Transformer Calculations  1
The NEC refers to transformers as “separately derived systems”
Code Quiz of the Week: No. 2
Take this weekly quiz to test your knowledge of the 2014 National Electrical Code requirements
Code Q&A: Acceptable Locations for Overcurrent Devices 
NEC requirements on acceptable locations for overcurrent devices
Code Q&A: GFCI Protection Requirements for Receptacles  4
What are the Code rules for GFCI protection requirements for receptacles?
Commercial Load Calculations — Part 2  2
If you were to watch daily operations at a marina [555.12], you’d see why its demand factors differ from those for other spaces such as hotel rooms.
Stumped by the Code? NEC Requirements When Replacing Nongrounding-type Receptacles 
Q. What are the requirements when replacing nongrounding-type receptacles?
Code Q&A: Receptacle Replacement Rules  2
What are the Code rules for receptacle replacement?
Code Q&A: Placing Receptacles in Damp or Wet Locations  2
What are the Code rules for installing receptacles in damp or wet locations?
Commercial Load Calculations — Part 1  3
The NEC contains detailed requirements for calculating service and feeder loads in many types of occupancies.
Code Q&A: Grounding Service-Supplied AC Systems 
What are the rules for grounding and bonding service equipment?
Code Q&A: Vertical Clearance Requirements for Overhead Conductors 
What are the rules for installing outside branch circuits and feeders?
Multifamily Dwelling Unit Load Calculations  3
Though similar, single and multifamily dwellings have distinct differences.
Stumped by the Code? NEC Basic Working Space Requirements for Electrical Equipment 
Q. What are the basic working space requirements for electrical equipment?
Code Q&A: Using the Neutral Conductor as the Circuit Equipment Grounding Conductor  1
What are the rules in using the neutral conductor for bonding of metal parts?
Code Q&A: Allowable Ampacity for Flexible Cords 
NEC rules on the ampacity requirements for flexible cords?
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