The Mike Holt Podcast

Grounding, High Impedance [250.36, 2020 NEC]

250.36 Grounding, High Impedance – https://www.MikeHolt.com/bonding. Did you know that a high impedance grounded ac system cannot serve line to neutral loads? In this podcast, we’ll explain what a high impedance grounded system is, where the impedance must be located, and how it differs from a conventional solidly grounded electrical system.

Grounding, Auxiliary Grounding Electrode [250.54, 2020 NEC]

250.54 Grounding, Auxiliary Grounding Electrode – https://www.MikeHolt.com/bonding. Are auxiliary grounding electrodes required by the NEC? Do they serve any real purpose? The answer(s) is/are, no. Find out why and how they might just do more harm than good in this compelling discussion with our panel of experts!

Ground Resistance Measurement [250.53(A)(2), 2020 NEC]

250.53(A)(2) Ground Resistance Measurement – https://www.MikeHolt.com/bonding. NEC 250.53(A)(2) requires that a single grounding electrode be supplemented by an additional electrode but, is that always the case? Learn the exceptions as well as what qualifies as a supplemental electrode as our panel of experts discuss this topic.

GFCI Protection Requirements [210.8, 2020 NEC]

210.8 GFCI Protection - https://www.Mikeholt.com/code. There’s no doubt that ground-fault circuit-interrupters have protected many people from electrical hazards. This Code cycle there is an increased emphasis on GFCI protection and many new locations that require GFCI protection have been added. The 2020 changes and revisions to this section are numerous and include clarifications, expansions to existing rules, and a few new items. Some rules were also relocated to and placed in more appropriate articles as indicated in the Informational Notes.

Fire-Rated Walls, Ceilings, and Floors [300.21, 2020 NEC]

300.21 Fire-Rated Walls, Ceilings, and Floors – https://www.MikeHolt.com/code. Wherever there’s airflow, the potential for a fire to spread exists. The requirements in section 300.21 of the NEC are designed to prevent, as much as possible, increasing the spread of fire where electrical installations may decrease fire-resistive ratings of walls, ceilings, and floors. In this podcast, you’ll learn what must be done in order to comply with this rule.

Fire Pump Motor Circuits [695.6(B)]

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. Listen to this podcast to ensure that you’re sizing fire pump circuit conductors correctly.

Feeder and Service Conductor Size [Table 310.12, 2020 NEC]

Service conductors supplying the entire load associated with a dwelling unit can be sized in accordance with Table 310.12 but are there any rules or considerations before using this table? What about if it’s a feeder instead? The answers to these and many other questions can be found by listening to this podcast on sizing these service/feeder conductors.

Equipment Grounding Conductor, Sizing (EGC) [250.122, 2020 NEC]

250.122 Equipment Grounding Conductor, Sizing – https://www.MikeHolt.com/bonding. The equipment grounding conductor sizes for 15A -30A circuits are easy to remember since they are required to be full sized and are part of cable assemblies. Larger circuits, however, typically require the use of Table 250.122 and that can be a little confusing. Listen to this podcast to better understand how these conductors are sized.

Equipment Grounding Conductor Types [250.119, 2020 NEC]

250.119 Equipment Grounding Conductor Types – https://www.MikeHolt.com/bonding. Equipment grounding conductors can be identified in several ways. In this video clip, we discuss how the NEC requires these conductors to be identified.

Energy Storage Systems (ESS), Scope 706.1, 2020 NEC

There is now so much sustainable electrical energy being produced that we need to find ways to store it! An Energy Storage System (ESS) consists of one or more components capable of storing electrical energy for future use. Article 706 in the NEC covers the requirements for ESS and it’s important to understand what Article 706 does and does not apply to. Find out why in this podcast on the Scope of Article 706.