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.

Cable Types Suitable for Use in Ducts and Plenums
Article 725 covers remote-control, signaling, and power-limited circuits that are not an integral part of a device or appliance.
Box Sizing Tips  3
So you go through all that work to correctly size your raceway, only to find out during the acceptance inspection that you have to replace some boxes and re-pull all of the conductors.
Stumped by the Code? NEC Requirements for Entrance and Egress 
Q. What are the NEC requirements for entrance and egress from electrical equipment working spaces?
Listed Cable Suitable for Use Under Raised Floors of ITE Rooms
Section 645.5(E) focuses on supply circuits and interconnecting cables placed under raised floors in an information technology equipment room.
Equipment Secured to Grounded Metal Supports
Part VII of Art. 250 focuses on the methods of equipment grounding.
Code Q&A: Swimming Pool Pump Motor Connections 
Q. Are cord and plug connections allowed for swimming pool pump motors?
Weight Requirement for Handhole Enclosure Cover
Article 314 covers the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes — depending on their use — and handhole enclosures.
Size Limitation for Type NUCC
Article 354 covers the use, installation, and construction specifications for nonmetallic underground conduit with conductors (NUCC).
Cable Tray System Uses Not Permitted
Article 392 covers cable tray systems, including ladder, ventilated trough, ventilated channel, solid bottom, and other similar structures.
Grounding Rules for Panelboards
Part III of Article 480 focuses on panelboards.
Luminaires Mounted on Combustible Low-Density Cellulose Fiberboard
Part XII of Article 410 this Article covers the special provisions for electric-discharge lighting systems of 1,000V or less.
Insulation of Batteries
The provisions of Art. 480 apply to all stationary installations of batteries.
Minimum Conductor Size for Motion Picture Equipment
The provisions of Article 540 apply to motion picture projection rooms, motion picture projectors, and associated equipment.
Emergency System Capacity
Article 700 applies to the installation, operation and maintenance of emergency systems.
Acceptable Uses for Tray Cable
Article 336 covers the use, installation, and construction specifications for power and control tray cable.
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