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-conditioni…
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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 …
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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 …
2.3K viewsJan 21, 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
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Sizing wire and protection for AC equipment is based on the namepl…
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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
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Factors that impact conductor sizing include not only conductor …
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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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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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