Mike Holt's Electrical ToolBox; is an amazing app for the electrician, industry.

110.13(A) Electrical equipment shall be firmly secured to the surface on which it is mounted.

Splices in an LB are permitted if the conductor volume doesn't exceed the conduit body volume.

Today is my 50th anniversary of providing electrical training. So what did I do to celebrate?

Thank you for allowing me to have a DREAM JOB for 50 years teaching the National Electrical Code.

There is no minimum conductor bending radius 'requirement' in NEC or wire manufacturer instructions.

NM Cables (Romex) must be sized to the 60C column of Table 310.16 as required by 334.80.

The number of EGCs permitted on a ground bar is based on the manufacturer instructions and 110.14(A)

See 250.97 for bonding jumpers for a metal raceway containing feeder/branch circuits.

See 250.97 for bonding jumpers for a metal raceway containing feeder/branch circuits.

GFCI protection is NOT required for HVAC equipment, including heatpumps for swimming pools and spas.

Maximum Raceway Length? Except for elevators, the NEC does not limit the length of a raceway.

Per industry standards, breakers are calibrated to perform at an ambient temperature of 40°C.

Equipment Grounding is a very complicated theory concept to understand.

Neutral-to-ground bond at services and sub-panels explained.

Electrical equipment must be installed in a professional and skillful manner.

Unused openings on electrical equipment must be closed to afford protection.

A non-separately derived generator does not need a ground rod, watch MikeHolt.com/Fundamentals

Flush-mounted boxes in noncombustible or combustible material. NEC 314.20

Receptacles for Electric Vehicle (EV) charging must be GFCI protected in accordance with 625.54.

Neutral-to -ground bond required at service and not permitted at subpanel.

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NFPA and Mike Holt Enterprises Continue the Partnership for 2026 Changes Book!

VIOLATION: The neutral conductor identification required by 200.6(B) is not at its terminations.

You have to use the correct screw when you secure a panel... I'm like what?

A feeder neutral conductor is not required at a panel or disconnect, unless the neutral is needed.

You don't need to adjust the ampacity for current-carrying conductors bundled in a panel [310.14(A)]

When more than three current conductors are bundled for more than 24", the ampacity must be adjusted

The NEC permits spare raceways from a panel and it does not require that an enclosure be installed.

Insulated neutral conductors 6 AWG and smaller must be identified white or grey per NEC 200.6(A).

If you get the Neanderthal attitude (get it done), you would accomplish a lot more in your life.

Feeders to a dwelling unit are not required to be larger than the service conductors Table 310.12(A)

Conductors 4 AWG and larger that enter a raceway must be protected prior to their installation.

A receptacle installed under porches can use a snap cover, a bubble cover not required [406.9(A)].

When making splices with twist-type wire connectors, should the wire nut be up or down?

The EGC conductor is sized in accordance with Table 250.122, base on the rating of the circuit OCPD.

Does the NEC require the GEC to be identified green? No, see 250.62 and 250.119.

GEC is not required to be larger than 4 AWG to a rebar electrode and 6 AWG to a ground rod, 250.66.

I'm on vacation and I took my bikes with me, but I miss you guys. So no technical message.

The conductors for a feeder can be sized using the Mike Holt's Electrical Toolbox. MikeHolt.com/App

Only one conductor is permitted to terminate on a terminal, unless identified otherwise.

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Wishing Mike Holt a Happy Birthday from all of us at Mike Holt Enterprises! 🎉

Wishing Mike Holt a Happy Birthday from all of us at Mike Holt Enterprises! 🎉

The phase conductors of a single-voltage system are not required to be identified, see 310.6(C).

Grounding of Remote Buildings [250.32]

Can you use the panelboard cabinet as a raceway?

I’m praying you are a Young Gun where you have a love for the NEC and are striving for success.