Mike Holt

Articles by Mike Holt
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
Stumped by the Code?
Grounding vs Bonding — Part 5 of 12
Do you know the right way to ground and bond buildings or structures supplied by feeders or branch circuits?
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