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    The foundation of electrical theory and the application of its principles

    Highlights

    Photo 1. When connections are properly installed, the bond is permanent and will not corrode or break over time.

    Qualifying Permanent Ground Connections

    Feb. 7, 2022
    An inside look at the IEEE 837 Standard

    NEC Requirements for Solar — Part 2

    July 17, 2024
    The circuit requirements for PV systems have two major “add-ins” versus those of other circuits.

    NEC Requirements for Solar — Part 1

    June 13, 2024
    Do you understand the general requirements and the bonding requirements for solar installations?

    NEC Requirements for Services — Part 2

    May 15, 2024
    Do you know the rules for service entrance conductors and service disconnects?

    NEC Requirements for Services — Part 1

    April 16, 2024
    Do you understand the conductor and equipment requirements for services?
    Fig. 1. An electrically powered passenger vehicle needs a dedicated charging circuit. Article 625 provides the requirements for installing the conductors and equipment for electric vehicle charging, power export, or bidirectional current flow.

    NEC Requirements for EV Equipment

    Nov. 9, 2023
    The electrical conductors and equipment for connecting an electric vehicle to premises wiring must meet specific guidelines.
    Fig. 1. Locations are classified according to the properties of the hazard.

    NEC Requirements for Hazardous Locations

    Oct. 11, 2023
    Article 500 prepares you for properly applying Articles 501 through 516.
    Fig. 1 The rules of Art. 445 include where generators can be installed, nameplate markings, conductor ampacity, and disconnect requirements.

    NEC Requirements for Generators

    Sept. 13, 2023
    Conductor sizing and the requirements for disconnecting means are the main electrical considerations in a generator installation.
    Fig. 1. A motor branch-circuit OCPD must be able to carry the motor’s starting current.

    NEC Requirements for Motors – Part 2 of 2

    Aug. 9, 2023
    Do you know how to protect motors and related equipment from overcurrent and ground faults?