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

  • Wednesday, December 13, 2017
    CQD: 12/13/2017

    Re: CQD answer published Tuesday, December 5, 2017 -Utility Clearance Heights

    1) It should be pointed out that the NESC Edition in force at the time that the crossing was made is still in force today. Additionally, some states are way behind with their adoption process (Indiana has only adopted the 2002 Edition of the NESC and the 2007, 2012, and 2017 have been issued). Due to the complexities of ice loading, wind, uses of the street, etc.; please contact the local utility for the specific answer to that type of question. Take care, Charlie Eldridge

    2) Charlie, Regarding the answer from 12/5/17, yes, the NESC does apply but be careful.  Just as the NEC is adopted, the NESC must also be adopted to apply.  And also like the NEC, not all states adopt the latest version.  Plus there can be local regulations that apply.  For example, in Illinois, the minimum across many streets is 18 feet, not the 15.5 feet listed in Table 232-1 for communication cables.  In addition to that, the NESC also applies conditions to that number that are not in the NEC.  An example of that is the ice loading that applies in certain areas.  With a coating of ice, the clearances remain the same as they do for fully loaded sags in the summer or the initial unloaded sags.  I guess my point is that you need to be aware of all the factors before you decide where to attach or mount the conductors under either Code.  This message is not intended to cover all the possibilities but to make your readers aware that they need to make sure they understand what is involved. Tom Adams

  • Tuesday, December 12, 2017
    CQD: 12/12/2017
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