National Electrical Installation Standards

Standards as High as Your Own

 

News & Updates

Call for Public Review

Featured Standards

neca 111-2017  cover

NECA 111-2017, Standard for Installing Nonmetallic Raceways (RNC,ENT, LFNC) (ANSI)

Describes installation procedures for nonmetallic raceways of circular cross-section used for electrical power wire and cable, communications wiring, or fiber optic cables.

» Learn More
neca-305_cover_web

NECA 305-2018, Standard for Installing Fire Alarm System Job Practices

This Standard describes practices for Installing, testing, and maintaining fire alarm systems. These job practices represent a minimum level of quality for fire alarm system installations.

» Learn More

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 »
Licensing Information by State ».

NEC Adoption by State

Building Codes Assistance Project Energy Code Adoption

Code Question of the Daytextbook

  • Wednesday, June 19, 2019
    CQD: 6/19/2019

    Keep up the good work. I have a new project to an old plant, 1976 construction.  The power provided is 480-volt, 3 phase, open delta, B phase grounded, hopefully at the service disconnect. The NEC seems to assume that all 3 phase systems are 4 wire wye. Shouldn’t the ground be separated from the grounded phase to the transfer switch and the B phase treated as any other phase and the ground a separate wire? Should the grounded phase be connected to the line side of the motor starters and continue to the motor? Where in the code is this situation covered?

    Thanks, Have a good day!!

    Lowell I. (Laddie) Wolfe Jr.

  • Tuesday, June 18, 2019
    CQD: 6/18/2019
    View Question and Answer

How's your knowledge?
» Get the Answer!