Originally Posted By: jtedesco
This post was automatically imported from our archived forum.
On the other hand, the pictures are very nice and the work shows a neat and workmanlike installation, but the use of one connector or opening for all of the cables is a MAJOR NEC DEFECT
and has been one for many, many years!
There can be no assumed local rule that would stand up in court if there was a FIRE
in that cabinet, and those here who want to think so, are missing the purpose of the rules in the National Electrical Code!
It takes some very careful understanding of the rues that follow below in order to give a qualified personal opinion.
My comments and opinions are based upon Fact's and I am sorry if this upsets anyone, but it is the name of the game, you have got to Cover Your a$%!
|312.5 Cabinets, Cutout Boxes, and Meter Socket Enclosures.
Conductors entering enclosures within the scope of this article shall be protected from abrasion and shall comply with 312.5(A) through (C).
(A) Openings to Be Closed. Openings through which conductors enter shall be adequately closed.
(B) Metal Cabinets, Cutout Boxes, and Meter Socket Enclosures. Where metal enclosures within the scope of this article are installed with open wiring or concealed knob-and-tube wiring, conductors shall enter through insulating bushings or, in dry locations, through flexible tubing extending from the last insulating support and firmly secured to the enclosure.
(C) Cables. Where cable is used, each cable shall be secured to the cabinet, cutout box, or meter socket enclosure.
Exception: Cables with entirely nonmetallic sheaths shall be permitted to enter the top of a surface-mounted enclosure through one or more nonflexible raceways not less than 450 mm (18 in.) or more than 3.0 m (10 ft) in length, provided all the following conditions are met:
(a) Each cable is fastened within 300 mm (12 in.), measured along the sheath, of the outer end of the raceway.
(b) The raceway extends directly above the enclosure and does not penetrate a structural ceiling.
(c) A fitting is provided on each end of the raceway to protect the cable(s) from abrasion and the fittings remain accessible after installation.
(d) The raceway is sealed or plugged at the outer end using approved means so as to prevent access to the enclosure through the raceway.
(e) The cable sheath is continuous through the raceway and extends into the enclosure beyond the fitting not less than 6 mm (? in.).
(f) The raceway is fastened at its outer end and at other points in accordance with the applicable article.
(g) Where installed as conduit or tubing, the allowable cable fill does not exceed that permitted for complete conduit or tubing systems by Table 1 of Chapter 9 of this Code and all applicable notes thereto.
FPN: See Table 1 in Chapter 9, including Note 9, for allowable cable fill in circular raceways.
See 310.15(B)(2)(a) for required ampacity reductions for multiple cables installed in a common raceway.
The exception, which was added for the 1999 NEC, spells out the requirements that allow multiple nonmetallic cables such as Type NM, NMC, NMS, UF, SE, and USE to enter the top of a surface-mounted enclosure through a nonflexible raceway sleeve or nipple. These sleeves or nipples are permitted to be 18 in. to 10 ft in length. However, if the nipple length exceeds 24 in., ampacity adjustment factors as specified in 310.15(B)(2) apply.
The main rule of 312.5(C) prohibits the installation of several cables bunched together and run through a knockout or chase nipple. Individual cable clamps or connectors are required to be used with only one cable per clamp or connector, unless the clamp or connector is identified for more than a single cable.
2002 NECode Information Courtesy: www.nfpa.org
Joe Tedesco, NEC Consultant