Auxiliary Gutter Fill

A similar change occurred in article 366 for auxiliary gutters.

Auxiliary gutter fill. We are allowed by code to fill a gutter to 20. And 20 of that is 7 2 sq. It also includes a custom fill selector so any percent fill can be selected for those jobs where the specs specify more stringent fill than the nec requires. Auxiliary gutters can be used to supplement wiring spaces at meters switchboards and similar places as well as enclosed conductors or busbars.

The sum of the cross sectional areas of all contained conductors at any cross section of an auxiliary gutter shall not exceed 20 of the interior cross sectional area of the gutter. Now when determining gutter or wireway fill the sum of the cross sectional areas of all contained conductors and cables at any cross section shall not exceed 20 percent of the interior cross sectional area of the wireway. Auxiliary gutters shall not contain more than 30 conductors at any cross section unless the additional conductors are for signal 01 control circuits. Where subject to severe corrosive environments.

However field people seldom determine the conductor fill requirements for a surface metal or nonmetallic raceway article 352 a metal or nonmetallic wireway article 362 or the wire space for a cabinet or cutout box article 373. Below is a preview of article 376. If you have a 6 x 6 gutter that would have total of 36 sq. Sheet metal auxiliary gutters can be used outdoors or indoors.

Cable size size of conductors table 2 allowable cable area in2 1. Where subject to severe physical damage. If they are installed in a wet location they must be suitable for a wet location. 36 x 20 7 2 sq.

The conductor fill requirements for a conduit or an outlet box are calculated in the field on a regular basis. In of space to use. The raceway fill calculator finds the minimum raceway and wireway and auxiliary gutter sizes. Splices and taps shall not fill the wireway to more than 75 percent of its area at the point of a splice or tap.