National Electrical Installation Standards

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Revision of NECA 121-201X, Standard for Installing Nonmetallic-Sheathed Cable (Type NM-B)and Underground and Branch Circuit Cable (TypeUF)

Revision of NECA 303-201X, Standard for Installing and Maintaining Closed-Circuit Television (CCTV) Systems


Revision of NECA 413-201X, Standard for Installing and Maintaining Electric Vehicle Supply Equipment (EVSE)



All NEIS Currently Available for Public Review

Featured Standards


NECA 416-2016 Recommended Practice for Installing Energy Storage Systems

This standard describes methods and procedures used for installing multiple types energy storage systems. It also includes information about controlling and managing energy storage systems, in addition to commissioning and maintaining energy storage systems.
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NECA/FOA 301-2016 Standard for Installing and Testing Fiber Optics

This standard describes installation and test procedures for fiber optic cabling networks. This standard applies fiber optic cabling installed indoors (premises installations) and outside plant (OSP) applications.
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State Regulationsusa country shape

Find the major provisions of electrical code, enforcement, and contractor/electrician licensing requirements for each state in the U.S.

US Electrical Codes & Regulations by State »
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NEC Adoption by State

Building Codes Assistance Project Energy Code Adoption

Code Question of the Daytextbook

  • Thursday, July 12, 2018
    CQD: 7/12/2018

    I had a new Carrier a/c unit installed this past July, 2017. The old unit had a disconnect box on it but the a/c guy did not install a disconnect box to my new unit and he refuses to install one. Can you post the electrical code that specifically says that a disconnect box needs to be installed either on the a/c unit or very near it, please? Thank you.

    Debra Guarneri

  • Wednesday, July 11, 2018
    CQD: 7/11/2018
    View Question and Answer

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