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.

One-Family Dwelling Unit Load Calculations 
efore you can size the branch circuits for a dwelling, you must calculate the loads.
Stumped by the Code? NEC Requirements for a Building Service Disconnecting Means 
Q. What are the requirements for a building service disconnecting means?
Code Q&A: Equipment Terminal Ratings  5
NEC rules on the requirements for conductor sizing as they relate to equipment terminal ratings?
Code Q&A: Panelboard Overcurrent Protection  4
What are the overcurrent protection requirements for panelboards?
Stumped by the Code? NEC Requirements for Sizing Service and Feeder Conductors 
Q. What are the rules for sizing service and feeder conductors to a single dwelling unit?
Code Q&A: Mixing Conductors from Different Voltage Systems  3
What are the rules related to the installation of conductors from different voltage systems — such as 120V, 208V, 240V, 277V, and 480V — in the same raceway or enclosure?
Components of a Solar PV System
For PV systems, a(n) _____ is a device that changes direct-current input to an alternating-current output.
Rating of Supply Conductors for X-Ray Equipment
The ampacity of supply branch-circuit conductors and the overcurrent protective devices for X-ray equipment shall not be less than _____.
Minimum Size Allowed for Fixture Wire? 1
The smallest size fixture wire permitted by the NEC is _____ AWG.
Luminaire Requirements in Class II, Division 2 Locations
Luminaires for fixed lighting in Class II, Division 2 locations shall be equipped with enclosures that are _____ or otherwise identified for the location.
Code Q&A: Sizing Bonding Jumper for Single Raceway 
What are the rules in sizing a supply side bonding jumper sized for a single raceway containing service conductors?
Minimum Clearance Requirement for Surface-Mounted Luminaire Installed in a Clothes Closet
Surface-mounted fluorescent luminaires in clothes closets shall be permitted on the wall above the door, or on the ceiling, provided there is a minimum clearance of _____ in. between the luminaire and the nearest point of a storage space.
Routing of SPD Conductors
The conductors used to connect the surge protective device to the line or bus and to ground shall not be any longer than _____ and shall avoid unnecessary bends.
How Many Supplies are Allowed?
A building or structure shall be supplied by a maximum of _____ feeder(s) or branch circuit(s), unless specifically permitted otherwise.
Minimum Conductor Size for Equipment Operating at Less than 50V
Conductors for an appliance circuit supplying more than one appliance or appliance receptacle in an installation operating at less than 50V shall not be smaller than _____ AWG copper or equivalent.
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