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.

Grouping of Conductors for PV Systems
PV system installation requirements are outlined in Sec. 690.4 of the 2011 NEC.
Testing Your Cable IQ
Do you know the allowable cable types for this type of installation?
Component Operation in a Solar Photovoltaic System
The provisions of Art. 690 apply to solar photovoltaic (PV) electrical energy systems, including the array circuit(s), inverter(s), and controller(s) for such systems.
Approved Wiring Methods in Class II, Division 2 Locations
Article 502 covers the requirements for electrical and electronic equipment and wiring for all voltages in Class II, Division 1 and 2 locations.
Code Q&A: Electric Water Heaters  2
Q. How are the branch circuit conductors and overcurrent protection sized for electric water heaters (120 gal or less)? Please provide an example.
Approved Conductor Sizes for ITC Type Cable
Article 727 covers the use, installation and construction specifications of instrument tray cable for application to instrumentation and control circuits operating at 150V or less and 5A or less.
Conductor Installation Ratings for Strip Lights in Theaters and Studios
Article 520 covers all buildings or structures that used for presentation, dramatic, musical, motion picture projection or similar purposes along with the seating areas in motion picture or television studios.
Disconnect Requirements for Permanently Connected Appliances
Article 422 covers appliances used in any occupancy.
Service-Entrance Cable Requirements
Service-entrance conductor requirements are outlined in Part IV of Art. 230.
Rating Requirement for Equipment Fastened in Place
Branch circuit rating requirements are outlined in Part II of Art. 210.
The Four Pillars of NEC Chapter 3  7
Four NEC Articles form the basis for correctly applying Chapter 3 wiring methods.
AC Systems Not Required to be Grounded
Section 250.21 focuses on alternating-current systems of 50V to less than 1,000V that are not required to be grounded.
Insulation Rating of Conductor Used in Lighting Equipment
Conductor construction and application rules are outlined in Table 310.104(A) through Table 310.104(E) of the 2011 NEC.
Personnel Protection of Impedance Heating Systems
The requirements of Art. 426 apply to electrically energized heating systems such as fixed outdoor electric deicing and snow-melting equipment.
Inspection of Manufactured Wiring Assembly
The requirements in Art. 602 apply to field-installed wiring using off-site manufactured subassemblies for branch, remote-control, signaling and communication circuits in accessible areas.
Electrical Testing Feed
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