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
Q. What is the minimum depth for placing Schedule 40 PVC conduit below a concrete slab?
Code Q&A
Q. How far away from a diesel fuel-dispensing tank must the nonexplosion-proof equipment be located?
Top 50 NEC Rules 3
310.15 Conductor Ampacity (A) General Requirements The ampacity of a conductor can be determined either by using the tables in accordance with 310.15(b), or under engineering supervision as provided in 310.15(C). FPN No. 1: Ampacities provided by this ...
Code Q&A
Q. When are insulated bushings required on raceway terminations?
Article 240: Overcurrent Protection 1
Article 240 provides the requirements for selecting and installing overcurrent protection devices (OCPDs). Depending on your application, other Articles
Code Quandaries
Q. Where in the Code does it say that sharing a neutral is acceptable?
Code Q&A
Q. A conductor passing through a box unbroken counts as one conductor, so if I loop a conductor through the box unbroken and strip off enough insulation to terminate on a receptacle without cutting the wire, does the conductor count as one or two conductors for box sizing?
Code Q&A
Q. I want to install fluorescent strip lights on a sheetrock ceiling. Can I support the fixtures directly over the recessed outlet box and connect to the branch-circuit wiring through a chase nipple?
Article 230: Services Part 2
Part 1 of this two-part series, which ran in last month's August issue, explored how to ensure your service entrance equipment meets Code. Starting with
Code Quandaries 1
All questions and answers are based on the 2005 NEC. Q. Can Type MC cable be installed from fixture to fixture without support above a suspended ceiling?
Code Q&A
Q. What is the minimum service drop clearance above a roof?
Code Q&A
Q. Can I use aluminum rigid metal conduit in a Class 1, Div. I hazardous (classified) location?
Article 230: Services Part 1 2
Article 230, which consists of seven parts, provides the installation requirements for service conductors and equipment. Parts II, III, and IV address
Stumped by the Code? 1
All questions and answers are based on the 2005 NEC. Q. Are there any restrictions on the length of outside conductor (without overcurrent protection)
Code Q&A
Q. Can the disconnect switch be located next to equipment installed above an accessible drop ceiling, or must the switch be installed at a readily accessible location?

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