Mike Holt Circuit Sizing - Air-Conditioning Sizing air-conditioning circuits are really simple. Just read the nameplate and use the NEC Table 310.16 (2020 NEC) and 240.4(D) and 240.4(G), 240.6, and 440.6(B). | Mike Holt Enterprises
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Mike Holt Circuit Sizing - Air-Conditioning Sizing air-conditioning circuits are really simple. Just read the nameplate and use the NEC Table 310.16 (2020 NEC) and 240.4(D) and 240.4(G), 240.6, and 440.6(B). | Mike Holt Enterprises
65.1K viewsMar 3, 2020
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Contrary to what many believe, there is no minimum conductor bending radius 'requirement' in the NEC or wire manufacturer instructions. For NM and AC cables, the radius of the curve of the inner edge of any bend shall not be less than five times the diameter of the cable [320.24 and 334.24]. For MC cable, the radius cannot be less than 10, 12, or 15 times the diameter of MC cable (dependent on cable diameter), see 330.24. #mikeholt #electricaltraining #electrician #electricaleducation #electrica
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Contrary to what many believe, there is no minimum conductor bending radius 'requirement' in the NEC or wire manufacturer instructions. For NM and AC cables, the radius of the curve of the inner edge of any bend shall not be less than five times the diameter of the cable [320.24 and 334.24]. For MC cable, the radius cannot be less than 10, 12, or 15 times the diameter of MC cable (dependent on cable diameter), see 330.24. #mikeholt #electricaltraining #electrician #electricaleducation #electrica
202.9K viewsJan 13, 2025
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In this video, NEC expert Mike Holt explains how to properly ground a corner grounded delta system and the special characteristics of these rare systems… | Mike Holt Enterprises
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In this video, NEC expert Mike Holt explains how to properly ground a corner grounded delta system and the special characteristics of these rare systems… | Mike Holt Enterprises
2.4K viewsJun 11, 2021
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In this video, NEC expert Mike Holt explains how to size a grounding electrode conductor and why it doesn’t need to be larger than the minimum Code requirements… | Mike Holt Enterprises
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In this video, NEC expert Mike Holt explains how to size a grounding electrode conductor and why it doesn’t need to be larger than the minimum Code requirements… | Mike Holt Enterprises
3.5K viewsJul 2, 2021
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The first time you’re called upon to size a conductor and overcurrent device for central air-conditioning and you look at the nameplate requirements that clearly state that a 10 AWG copper conductor and a 50A OCPD are required, it may contradict everything you’ve learned about small conductors. In fact, you may adamantly insist that 6 AWG is required by the Code and you’d be wrong! Learn why in this video on section 440.4(B) of the NEC... https://www.mikeholt.com/newsletters.php?action=display&l
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The first time you’re called upon to size a conductor and overcurrent device for central air-conditioning and you look at the nameplate requirements that clearly state that a 10 AWG copper conductor and a 50A OCPD are required, it may contradict everything you’ve learned about small conductors. In fact, you may adamantly insist that 6 AWG is required by the Code and you’d be wrong! Learn why in this video on section 440.4(B) of the NEC... https://www.mikeholt.com/newsletters.php?action=display&l
2.3K viewsJan 21, 2021
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Generac generator power and control wires are permitted to be installed in the same raceway, see installation instructions [110.3(B)] and NEC 300.3(C)(1). | Mike Holt Enterprises
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Generac generator power and control wires are permitted to be installed in the same raceway, see installation instructions [110.3(B)] and NEC 300.3(C)(1). | Mike Holt Enterprises
60.5K viewsJul 10, 2024
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When a fault occurs in an electrical appliance, like a gas range, the connected metal gas piping could become energized exposing users to possible electric shock or fires caused by pinhole leaks in the gas piping caused by arcing. To eliminate these hazards, metal gas piping must be properly bonded per NEC 250.104(B). This section covers metal piping systems, including gas piping, when they’re likely to become energized. Want to learn more? Join Mike and the team in the video as they break down
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When a fault occurs in an electrical appliance, like a gas range, the connected metal gas piping could become energized exposing users to possible electric shock or fires caused by pinhole leaks in the gas piping caused by arcing. To eliminate these hazards, metal gas piping must be properly bonded per NEC 250.104(B). This section covers metal piping systems, including gas piping, when they’re likely to become energized. Want to learn more? Join Mike and the team in the video as they break down
16.2K viewsApr 4, 2025
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The grounding electrode conductor is permitted to originate at the meter enclosure or service equipment. It’s just that simple, see 250.24(A)(1). | Mike Holt Enterprises
138.5K viewsMay 24, 2024
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Locking service disconnect? | Mike Holt Enterprises
19.8K viewsJun 1, 2024
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Careful, use the grounding terminal bar specified by the panelboard cabinet manufacturer [408.40]. Don’t get creative use a random ground bar… | Mike Holt Enterprises
103.5K viewsJul 29, 2024
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When burying wiring we need to have sufficient ‘cover’ in accordance with NEC Table 300.5(A). In this case it’s at least 20 inches, not 18! | Mike Holt Enterprises
91.4K viewsJul 15, 2024
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Grounding of Remote Buildings [250.32] Install the Grounding Electrode Conductor [250.32(A)] and the Equipment Grounding Conductor [250.32(B)] to the terminal bar connected to the cabinet [408.40]. Careful, NEVER connect the neutral terminal to the metal enclosure with the manufacture provided green screw [250.32(B). | Mike Holt Enterprises
67.4K viewsAug 9, 2024
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What are the NEC requirements for bonding of gas piping systems? What other than NEC requirements are involved in bonding metal gas piping? Metal gas piping must be bonded to the circuit equipment grounding conductor if there likely to become energized. However, many AHJ’s throughout the country enforce the metal gas piping to be bonded with an additional bonding jumper in accordance with the National Fuel Gas Code. | Mike Holt Enterprises
3.8K viewsOct 15, 2021
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Sizing wire and protection for AC equipment is based on the nameplate. Yes 10 AWG on 40A breaker is correct. Watch MikeHolt.com/AC to understand why! I bet the Electrosaurs will have heart-burn… | Mike Holt Enterprises
205.9K viewsJun 13, 2024
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Factors that impact conductor sizing include not only conductor ampacity and equipment terminal temperature rating, but also the conductor insulation temperature rating. In this video we discuss Table 310.4(A) which provides information on conductor insulation properties such as letter type, maximum operating temperature, application, insulation, and outer cover properties… | Mike Holt Enterprises
3.4K viewsApr 16, 2021
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If you remember that the whole purpose of bonding is to establish an “effective ground-fault current path” in order to clear a fault, then you can better understand why proper bonding of raceways is crucial in maintaining a safe electrical installation… | Mike Holt Enterprises
2.4K viewsApr 2, 2021
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Send me some video of failed aluminum wire terminations because antioxidant paste was not use at terminations. Mike@MikeHolt.com. | Mike Holt Enterprises
24K viewsJul 22, 2024
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The circuit equipment grounding conductor is sized in accordance with NEC Table 250.122, base on the rating of the circuit overcurrent protection device. For example, the EGC for a 100A feeder would need to be 8 AWG copper or larger. | Mike Holt Enterprises
33.6K viewsSep 9, 2024
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The NEC does not require connector for the Grounding Electrode Conductor. NEC fact after 125 years. | Mike Holt Enterprises
38.6K viewsJul 26, 2024
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Many think that grounding protects against a ground fault, but physics and the National Electrical Code prove otherwise. Watch MikeHolt.com/GroundRod | Mike Holt Enterprises
77.5K viewsApr 27, 2024
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For an installation to be safe from electric shock, run an equipment grounding conductor to the metal pole. Not a ground rod! See NEC 250.4(A), 250.54, and 410.30(B)(5). | Mike Holt Enterprises
180.1K viewsMay 9, 2024
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Bonding bushing/jumpers are not required for raceways that enter a clean punch KO. See NEC 250.97 | Mike Holt Enterprises
153.2K viewsJul 17, 2024
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Mike Holt is the OG. Appreciate your knowledge. #electrician #solar #apprentice #boxfill #construction | Electrician Joe
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