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 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?
Fire Alarm System Facts 5
Article 760 tells us how to install wiring and equipment for fire alarm systems, including all circuits these devices control and provide power to. What
Code Quandaries
Q. How far away must I locate a receptacle outlet from a shower or bathtub?
Top 50 NEC Rules
(A) Grounding Electrode. To provide a path to earth for lightning, each building or structure must have its disconnecting means grounded (earthed) to one of the following electrodes : Underground metal water pipe Metal frame of the building or ...
Code Q&A
Q. Do I have to use bonding jumpers around listed reducing washers?
Grounding and Bonding of Separately Derived AC Systems
A separately derived system is a premises wiring system with no direct electrical connection to conductors originating from another system . All transformers, except autotransformers, are separately derived because the primary circuit conductors do not ...
Code Q&A
Q. If an outdoor generator has a disconnect, do I need an additional disconnect where the conductors enter the building?
Stumped by the Code?
All questions and answers are based on the 2005 NEC. Q. Am I required to bond around reducing washers? A. Surprisingly enough, the answer is no. You don't
Article 725: Around the Circuit Part 2 1
In last month's Code Basics article, starting on page 56 of the September issue, we spent most of our time discussing Class 1 circuits. Now, it's time
Code Q&A
Q. Can I use 12-3 NM cable to wire the bathroom GFCIs and laundry circuit in a dwelling?
Top 50 NEC Rules
(A) Grounding. Services supplied from a utility transformer that is grounded to the earth must have the grounded neutral conductor grounded to a suitable grounding electrode in accordance with the following: (1) Accessible Location. A grounding ...
Grounding & Bonding Requirements
You basically perform work on two types of systems: solidly grounded or ungrounded. The general requirements for grounding and bonding these systems can be summarized as follows
Code Q&A
Q. I recently saw an advertisement for red conduit that is to be used for emergency circuits. Is this a Code requirement?
Article 725: Around the Circuit Part 1
Any time you are working with burglar alarm, access control, sound, nurse call, or intercom systems, as well as computer networks, lighting dimmer controls,
Code Quandaries
Q. What size conductor is required for a 25-hp, 208V, 3-phase fire pump motor?
Newsletter Signup

Sponsored Introduction Continue on to (or wait seconds) ×