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.

General Requirements for Sensitive Electronic Equipment
The provisions of Art. 647 cover the installation and wiring of separately derived systems operating at 120V line-to-line and 60V to ground for sensitive electronic equipment.
Motors & Generators Installed in Class I, Division 1 Locations
Article 501 covers the requirements for electrical equipment and wiring installed in Class I, Division 1 and 2 locations.
Ampacity of Generator Conductors
Article 445 contains installation and other requirements for generators.
Code Q&A: 25-Ft Tap Rule  3
Q. Please explain the 25-ft tap rules in the NEC?
Isolated Ground Receptacle Requirements 1
Article 250 covers the bonding and grounding requirements outlined by the NEC.
Cablebus Conductor Sizing
Article 370 covers the use and installation requirements of cablebus and associated fittings.
The Basics of Conductor Sizing — Part 1  6
Unfortunately, making the proper choices when sizing electrical conductors can get complicated.
Stumped by the Code? NEC Requirements for Sizing Conductors for an Electric Water Heater 
Q. How do we size the conductors and maximum overcurrent protection for an electric water heater? Please give an example.
Definition of a Stand-Alone System
The provisions of Art. 690 apply to solar PV systems.
Identification Requirements for Interconnected Power Sources
Article 705 covers installation of one or more electric power production sources operating in parallel with a primary source(s) of electricity.
Control Space Lighting Requirements
Branch circuit wiring requirements for machine room or control room/machinery space or control space lighting and receptacles are outlined in Sec. 620.23.
Electrical Connection Marking Requirements
Section 110.14 of the 2014 NEC focuses on electrical connections.
Branch Circuit Voltage Limitations
Article 210 covers the requirements for branch circuits.
Grounding Electrode Burial Depth Requirements
Part III of Article 250 focuses on the grounding electrode system and grounding electrode conductor requirements
IMC and Dissimilar Metals
Article 342 covers the use, installation, and construction specifications for intermediate metal conduit (IMC) and associated fittings.
Electrical Testing Feed
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