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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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
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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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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
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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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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
206K viewsJun 13, 2024
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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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Many think a ground rod provides protection against a ground fault. But that’s not true. Watch MikeHolt.com/GroundRod. | Mike Holt Enterprises
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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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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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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 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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Such an exciting time - the Changes to the National Electrical Code, 2026 edition is HERE! Learning the changes to the 2026 Code is essential for every electrical professional. This new textbook and series make learning the Code easier than ever. We’re thrilled to be partnering once again with the National Fire Protection Association® (NFPA®) on the 2026 Changes textbook. Combine it with Mike Holt’s engaging dynamic videos to strengthen your Code knowledge, reduce mistakes, and work with confide
4.4K views6 months ago
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A feeder neutral conductors is not required to be run to a panel or disconnect, unless the neutral is needed at the panel or disconnect. Examples of when a neutral conductor is required at a panel is you have line-to-neutral loads (like 120V). If you have only 240V two-pole circuit breakers, then a neutral is not required and serves no value. If you have a GFCI in the panel or disconnect, then a neutral conductor is required for the line-side of the GFCI; even if the load-side of the 240V GFCI d
87.1K viewsOct 7, 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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23:34
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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