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.

Grounding vs Bonding — Part 9 of 12
Do you know when an isolated ground is appropriate and how to properly install it?
Code Quandaries
All questions and answers are based on the 2005 NEC. Q. Where are hospital-grade receptacles required? A. Receptacles for inpatient sleeping beds or procedure
Code Q&A
Q. Can a stranded 12 AWG wire be placed under the screws for receptacles and switches? A. Conductor terminations must comply with manufacturer’s instructions as required by 110.3(B). For example, if the instructions for the device state “Suitable for ...
Code Q&A
Q. What size grounding electrode conductor is required for a 1,200A service supplied with three sets of 600 kcmil conductors per phase? A. When not run to a ground rod, concrete-encased electrode, or ground ring, the grounding electrode conductor must ...
Grounding vs Bonding — Part 8 of 12
Don’t use the equipment grounding conductor for grounding
Code Quandaries
All questions and answers are based on the 2005 edition of the NEC. Q. Where must the system-bonding jumper at a transformer be installed? A. The metal
Code Q&A
Q. How would you size the bonding wire to a motor that’s protected by an inverse time circuit breaker? A. The equipment grounding (bonding) conductor must be sized in accordance with Table 250.122, based on the ampere rating of the circuit-protection ...
Code Q&A
Q. What’s the minimum and maximum height for electrical equipment that contains circuit breakers or switches? A. There is no minimum height for switches and circuit breakers. However, 550.32(F) requires the service disconnecting means enclosure for ...
Grounding vs Bonding — Part 7 of 12
Errors in sizing and installing grounding electrode conductors can cause your entire grounding system to fail
Code Q&A
Q. Must receptacles be installed so they can be removed without interrupting the power to any downstream receptacles? A. Continuity of the grounded neutral conductor of a multiwire branch circuit must not be interrupted by the removal of a wiring ...
Code Q&A
Q. Does the NEC restrict the placement of a light switch in a bathroom? What about pools, spas, and hot tub areas? A. Switches can be located next to, but not within, a bathtub, hydromassage bathtub, or shower space (404.4 and 680.70 and 680.72). ...
Grounding vs Bonding — Part 6 of 12
How solid is your understanding of grounding electrode systems?
Code Q&A
Q. Does the Code require an electric motor driven fire pump to be connected to a standby generator if a standby generator is installed on the premises? A. Power to fire pump motors must be supplied by a reliable source of power (695.3) that has the ...
Code Q&A
Q. Can I terminate two wires on a single-pole circuit breaker? A. Yes, if the terminal is identified for two conductors, either within the equipment instructions or on the terminal itself. It’s my understanding that only Square D circuit breakers (15A, ...
Code Quandaries
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