27 Apr 2018
Decades ago, when Type MC Cable first became approved for use by the National Electric Code (NEC), some states and municipalities were hesitant to accept the new wiring method preferring to maintain using traditional methods. Over time, the benefits of cable became widely known and states slowly began accepting them into their codes.
The state of North Carolina Electrical Code (NCEC) closely follows the National Electrical code (NEC) and allows the use of Type MC or Type AC cables. However, projects funded by the State Government must follow the NC “Electrical Guidelines and Policies” document published by the North Carolina State Construction Office (SCO) for all projects on state property. The use of Type MC Cable was permitted but limited to use in lengths of six feet or less per Section 26-05-19 of the Guidelines.
After many years, the SCO updated their Guidelines to remove the six foot length restriction. The full Guidelines document may be found here. The excerpt below highlights the revision to allow MC Cables.
“Upon consultation with the State Construction Office, Review Section, the use of type MC Cable may be approved. The MC Cable: 1) conductors shall be provided with minimum #12 AWG solid copper rated at 600 Volts, 2) Ungrounded conductors shall match the color code of associated phase conductors, and 3) shall contain minimum #12 AWG separate green ground wire. In small buildings (less than 6000 square feet) with wood frame construction, designer may specify MC Cable to minimize damage to structure.”
To find out which version of the NEC your state has adopted, visit the NFPA Website. This site allows you to see the adoption status of your state, along with links to your state’s building and electrical code websites for additional information.
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