The Mike Holt Podcast

Bonding, Metal Raceways [250.97, 2020 NEC]

250.97 Bonding, Metal Raceways – https://www.MikeHolt.com/bonding. If you remember that the whole purpose of bonding is to establish an “effective ground-fault current path” in order to clear a fault, then you can better understand why proper bonding of raceways is crucial in maintaining a safe electrical installation.

Bonding, Communications Equipment [250.94, 2020 NEC]

250.94 Bonding, Communications Equipment – https://www.MikeHolt.com/bonding. Many believe that because of lower the operating voltages of communications systems, proper bonding of such systems is no big deal. That couldn’t be further from the truth! Find out why intersystem bonding and creating a “zero” potential is an important factor in a safe electrical system.

Bonding Jumper, Supply Side [250.102, 2020 NEC]

250.102 Bonding Jumper, Supply Side – https://www.MikeHolt.com/bonding. There are basic rules for supply-side bonding jumpers, find out just what those rules are in this video clip.

Article 242 Overvoltage Protection

Mike Holt discusses Overvoltage Protectors with John Cavaroc, Ph.D., P.E. from Safe Laboratories and Engineering Corp.

Arc-Flash Hazard Warning Label [110.16, 2020 NEC]

110.16 Arc-Flash Hazard Warning Label – https://www.MikeHolt.com/code. What’s an arc-flash warning label? Where do these warnings need to appear? Who’s responsible for posting these warnings? The answers to these questions (and more) are discussed in this podcast on section 110.16 of the NEC.

Ampacity Table [310.15, 2020 NEC]

The number of conductors in the same raceway that are carrying current can affect conductor ampacity, as can the ambient or surrounding temperature. In this video we’ll explain how to evaluate these factors to make the proper choice when sizing electrical conductors.

Air-Conditioning, Circuit Sizing [440.4(B), 2020 NEC]

440.4(B) Air-Conditioning, Circuit Sizing – https://www.MikeHolt.com/code. 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 podcast on section 440.4(B) of the NEC.

Adjustable-Speed Drives [430 Part X]

Adjustable-speed drives can be variable-frequency speed drives(VFDs)—which refer to alternating-current drives only, or variable-speed drives (VSDs) which can be alternating-current or direct-current drives. Either of these can vary the speed of a motor, one by altering frequency and the other by adjusting voltage. But how does this affect the conductor sizing for the motor branch circuit? Does it even have an effect? Find out in this video on the topic of adjustable-speed drives.

Mike's Story

In this podcast Mike Holt, Electrical Code Expert and President of Mike Holt Enterprises (www.mikeholt.com) shares the experiences, the struggles and the events that have shaped him, in addition to providing encouragement to others.