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Code Alert: Montana, 15 September 2010

Montana Adopts 2008 NEC

Effective July 30, 2010, Montana began enforcement of the latest edition of the National Electrical Code, marking completion of adoption efforts for states in the west. Only a few isolated jurisdictions have not moved to the 2008 NEC, or at least completed have completed the adoption process and are awaiting implementation. California adopted in January 2010 and will begin enforcement on January 1, 2011, and the Clark County/ Las Vegas area will begin enforcement in July 2011. Hawaii has also adopted the 2008 NEC, but implementation is uncertain pending disposition of other construction codes. Only the metropolitan areas of Tucson, AZ and Reno/Sparks, Nevada are still on the 2005 Edition with no definitive plans to move forward in the foreseeable future.

The Montana Building Codes Bureau made only a few modifications to the technical requirements of the current NEC:

24.301.411 WIRING STANDARDS (1) The National Electrical Code is amended as follows:

  • NEC ARTICLE 110.2 (SUPPLEMENTARY). When requested, complete wiring diagrams shall be provided prior to installation of conductors and equipment indicating the conductor's and equipment's intended use.

  • NEC Article 550.32(A): The allowable distance for service equipment from the exterior wall of a manufactured or mobile home is increased from 30 ft (9.14 m) to 50 ft (15.24 m).

  • NEC Article 550.33(A): Add the following: It shall be permissible to feed a manufactured (mobile) home with type SER cable when the service equipment is mounted on the exterior of the home. Physical protection of the cable is required by enclosing the cable in an approved raceway where the cable is run on the outside of the home. The cable is to be properly supported and attached per Article 338 where installed under the home.

  • NEC Article 760.1 (SUPPLEMENTARY). Smoke alarms shall be installed in any building or structure as required under the currently adopted International Building Code or International Residential Code, whichever applies, regardless of whether or not the building or structure is exempt by 50-60-102, MCA.

  • With only the forgoing amendments, Montana residents and visitors will be protected by the latest technology and products designed to mitigate the incidents of electrical fires, electrical shock incidents, and also protect infants from shock and burns. The expanded use of ground fault circuit interrupters, arc fault circuit interrupters, and tamper resistant receptacles are just a notable few of the many safety enhancements that Montana elected to implement.

    The complete text of the Montana adoption may be found at http://bsd.dli.mt.gov/bc/pdf/bc_rules.pdf with the electrical rules beginning on page 73, in Subchapter 4, Section 24.301.402.

    Submitted by Joe Andre



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