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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This new section requiring the installation of a surge-protective device (SPD) for all dwelling unit services has been a long time coming. Up until now, dwelling unit surge protection has been optional and usually an “extra” for the electrician. Section, 230.67, now requires surge protection for all dwelling unit services to protect sensitive life safety devices like smoke and CO detectors from surge damage. | 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
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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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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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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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