The Mike Holt Podcast

Splices in Panel Enclosures [312.8, 2020 NEC]

312.8 Splices in Panel Enclosures – https://www.MikeHolt.com/code. When it comes to electrical enclosures, “As long as we can get the cover on, we’re good.” is the mindset of many. The NEC has requirements for fill or how much space inside an enclosure is available for wiring and electrical devices as you’ll see when you listen to this podcast on section 312.8.

Solar Photovoltaic (PV) Systems, Rapid Shutdown [690.12]

The 2020 Code cycle brought many changes to Article 690, Solar Photovoltaic (PV) Systems. Some of the more notable changes were in section 690.12 for "Rapid Shutdown" and are discussed in this podcast.

Solar Photovoltaic (PV) Systems, Grounding Electrode System [690.47]

Do you know how a Grounding Electrode System works? What about grounding for PV Systems? Is a grounding system even required? The answers to these questions and more can be found in this podcast.

Solar Photovoltaic (PV) Systems, Equipment Grounding and Bonding [690.43]

Bonding and Grounding of PV Equipment is a requirement in Section 690.43 of the NEC and references sections in Article 250. Find out how to ground the equipment and why it needs to be done!

Sizing Raceways Using Annex C [2020 NEC]

If you've pulled wire into a raceway, you understand the reason to have limits on the wire fill for raceways. In this podcast, we’ll discuss the most common condition, where multiple conductors of the same size are installed together in a raceway and the maximum number of conductors permitted can be determined from the tables in Annex C.

Service Equipment Surge Protection [230.67, 2020 NEC]

230.67 Service Equipment Surge Protection - https://www.mikeholt.com/code. 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.

Service Disconnects, Six Maximum [230.71, 2020 NEC]

230.71 Service Disconnects, Six Maximum – https://www.MikeHolt.com/code. When it comes to service disconnects, the rule of six movements of the hand is pretty well established but, can there ever be more than six? Just how does the NEC define a “service” and does this definition allow for more than six service disconnects? In this podcast on section 230.71, we discuss the requirements regarding the maximum number of service disconnects.

Service Disconnecting Means [230.71, 2020 NEC]

230.71 Service Disconnecting Means - https://www.MikeHolt.com/code. Although the rule of six grouped service disconnects didn’t change, disconnects are now required to be compartmentalized to reduce the hazards associated with arc-flash and arc-blast. This might not seem like a big change but, it makes most of the available multi-meter centers and switch boards ineligible for use to meet these requirements.

Rooftop Air-Conditioning Equipment Grounding Conductor [440.9, 2020 NEC]

440.9 Rooftop Air-Conditioning Equipment Grounding Conductor – https://www.MikeHolt.com/code. You may already be aware that metal raceways such as RMC and EMT are suitable equipment grounding conductor types, but what about where roof-top air-conditioning equipment (roof-top units or RTUs) is concerned? Discover the unique requirements for RTUs in this podcast about section 440.9 in the NEC.

Receptacles in Damp or Wet Locations [406.9, 2020 NEC]

406.9(C) has redefined the bathtub or shower “zone” and prohibits the installation of receptacles in this area. Don’t worry, some latitude was added to the rule allowing for receptacles to be installed in bathrooms too small to meet these requirements.