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
65.3K viewsMar 3, 2020
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To determine what size feeder is needed to carry a certain amount of current, the temperature rating of the conductor and associated terminals must be taken into consideration. Factors that impact feeder sizing include conductor ampacity, equipment terminal temperature rating, continuous load factors, overcurrent protection requirements, conductor insulation temperature rating, ambient temperature corrections, and conductor bundling adjustment. At first glance all of this may seem a bit overwhel
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To determine what size feeder is needed to carry a certain amount of current, the temperature rating of the conductor and associated terminals must be taken into consideration. Factors that impact feeder sizing include conductor ampacity, equipment terminal temperature rating, continuous load factors, overcurrent protection requirements, conductor insulation temperature rating, ambient temperature corrections, and conductor bundling adjustment. At first glance all of this may seem a bit overwhel
2.9K viewsJul 16, 2024
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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
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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
97.1K viewsJun 13, 2024
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Motor Conductor and Short-Circuit Ground-Fault Protection Sizing. Conductors are sized at 125% of Motor FLC (Article Table), based on 75C column of Table 310.16 (all terminals are rated 75C), see NEC 110.14(C)(1)(a)(3) and 430.22(A) [22A x 125% = 28A]. Breaker used for short-circuit ground-fault protection sized to 250% of motor FLC, see NEC 430.52(C)(1)(a) [22A x 250% = 55A]. The limitation of 30A protection for 10 AWG does not apply to motor branch circuits, see NEC 240.4(D) and 240.4(G). As f
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Motor Conductor and Short-Circuit Ground-Fault Protection Sizing. Conductors are sized at 125% of Motor FLC (Article Table), based on 75C column of Table 310.16 (all terminals are rated 75C), see NEC 110.14(C)(1)(a)(3) and 430.22(A) [22A x 125% = 28A]. Breaker used for short-circuit ground-fault protection sized to 250% of motor FLC, see NEC 430.52(C)(1)(a) [22A x 250% = 55A]. The limitation of 30A protection for 10 AWG does not apply to motor branch circuits, see NEC 240.4(D) and 240.4(G). As f
74.7K views5 months ago
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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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Fire Pump Circuit Sizing is Mind-Blowing! Short-Circuit/Ground-Fault Protection Size - Protection must have an ampere rating not less than the nameplate locked-rotor current of the fire pump motor (between 6 to 8 times motor FLC) [NEC695.4(B)(2)(1)]. Conductor Sizing - Conductors must have an ampacity of not less than 125 percent of the motor full-load current rating in accordance with 430.22 [NEC 695.6(B)(2)]. In this example, a 34A FLA/183A LRC fire pump motor requires 200A protection [240.6(A
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Fire Pump Circuit Sizing is Mind-Blowing! Short-Circuit/Ground-Fault Protection Size - Protection must have an ampere rating not less than the nameplate locked-rotor current of the fire pump motor (between 6 to 8 times motor FLC) [NEC695.4(B)(2)(1)]. Conductor Sizing - Conductors must have an ampacity of not less than 125 percent of the motor full-load current rating in accordance with 430.22 [NEC 695.6(B)(2)]. In this example, a 34A FLA/183A LRC fire pump motor requires 200A protection [240.6(A
40.2K views5 months ago
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How much do you really know about SPD’s? What is their purpose? How do they accomplish this purpose? How many might be required and where in the electrical system are they to be located? Do you need to install a Type 1 SPD, or Type 2, 3, or 4 and what defines these various “Types?” Discover the answers to all of these questions and more in this video on Article 242, where Mike and an expert panel breakdown everything you need to know about “Surge Protective Devices (SPDs)” and the theory behind
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How much do you really know about SPD’s? What is their purpose? How do they accomplish this purpose? How many might be required and where in the electrical system are they to be located? Do you need to install a Type 1 SPD, or Type 2, 3, or 4 and what defines these various “Types?” Discover the answers to all of these questions and more in this video on Article 242, where Mike and an expert panel breakdown everything you need to know about “Surge Protective Devices (SPDs)” and the theory behind
231 viewsJan 21, 2021
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Sizing conductors and short-circuit ground-fault protection for A/C equipment is Easy! All you need to do is follow the equipment nameplate! The nameplate short-circuit/ground-fault protection is sized to 225% of the load [440.22} and conductors are sized to 125% of load [440.32]. Understand that 240.4(G) overrides the limitations of 240.4(D) and that the A/C equipment has internal overload protection. Note 1: If the wiring method was NM Cable (Romex), then the conductors are sized to 60C column
75.9K views5 months ago
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The time it takes for the overcurrent device to trip depends on a number of factors, one of which is the “time-current-curve characteristic” (TCC) of the specific overcurrent protective device. Download a FREE PDF of this section as you join Mike and the team explain this topic in detail. Click the link below. 🔗https://www.MikeHolt.com/newsletters.php?action=display&letterID=2710 For more information on this topic, get a copy of Mike Holt's Understanding Electrical Theory video program and text
615 viewsSep 28, 2023
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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
3.3K viewsApr 16, 2021
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There is no definitive answer about GFCI protection on hardwired EV chargers outside dwelling units. The decision will have to be made by the inspector. See 90.4, 110.3(B), 210.8(F), and 625.54. | Mike Holt Enterprises
9.1K viewsMay 31, 2024
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Many think a ground rod provides protection against a ground fault. But that’s not true. Watch MikeHolt.com/GroundRod. | Mike Holt Enterprises
71.6K viewsApr 27, 2024
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A fire pump wouldn’t be of much use during a fire if the circuit conductors that supply it failed. Sizing these conductors isn’t the same as sizing other motor conductors. Watch this video to ensure that you’re sizing fire pump circuit conductors correctly. #2020NEC #NationalElectricalCode #ElectricalTraining #ElectricalIndustry #ElectricalSafety #NECRequirements | Mike Holt Enterprises
2.6K viewsSep 17, 2021
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Selective coordination is when overcurrent protective devices are designed to clear a short circuit or ground fault in a manner that localizes the short circuit or ground fault to that given circuit. Download a FREE PDF of this section as you join Mike and the team explain this topic in detail. Click the link below. 🔗www.MikeHolt.com/newsletters.php?action=display&letterID=2722 Want to learn more about this topic? Mike's Understanding Electrical Theory video program is a great tool to learn fun
346 viewsOct 26, 2023
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The circuit equipment grounding conductor (EGC) is sized in accordance with NEC Table 250.122, based on the rating the circuit overcurrent protection device. For example, the EGC for a 100A feeder would need to be a minimum of 8 AWG copper. | Mike Holt Enterprises
12.4K viewsSep 9, 2024
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Code video 440.4 Marking on Hermetic Motor Compressors and Equipment Want to know how easy it is to size the conductor and breaker or fuse for hermetic motor compressor equipment? It’s simple, just follow the equipment manufacturer’s nameplate ratings for sizing the minimum conductor and maximum overcurrent protection sizes as explained in the National Electrical Code section 440.4. Ever heard that guy who says, “you can’t protect that 10 AWG with a 50A circuit breaker.” Don’t be “that guy”! Wat
3.3K views10 months ago
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Do you know the purpose of an equipment grounding conductor? The intent of the equipment grounding conductor (EGC) is to provide an effective ground-fault current path back to the source of the electrical circuit to trip the overcurrent protective device and clear a fault fast. This might surprise you, but there are fourteen permitted types of equipment grounding conductors listed in the NEC. Want to know what they are — and why they matter? Learn all you need to know about the purpose of equipm
16.1K views7 months ago
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Mike Holt Enterprises on Instagram: "Sizing conductors and short-circuit ground-fault protection for A/C equipment is Easy! All you need to do is follow the equipment nameplate! The nameplate short-circuit/ground-fault protection is sized to 225% of the load [440.22} and conductors are sized to 125% of load [440.32]. Understand that 240.4(G) overrides the limitations of 240.4(D) and that the A/C equipment has internal overload protection. Note 1: If the wiring method was NM Cable (Romex), then t
44.7K views5 months ago
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