in.2 mm2
1% x i3/.6 0.887 572 0.355 229 0.222 143
l5/8 X 1 1.151 743 0.460 297 0.288 186
1% X l 3/8 1.677 1076 0.671 433 0.419 270
l5/8 X 1% 2.028 1308 0.811 523 0.507 327 l5/8 X 27.6 3.169 2045 1.267 817 0.792 511 l5/8 X 3'/4 4.308 2780 1.723 1112 1.077 695
1 Vi x VA 0.849 548 0.340 219 0.212 137
V/2X V/l 1.828 1179 0.731 472 0.457 295
'Raceways with external joiners shall use a 40 percent wire fill cal- culation to determine the number of conductors permitted. "Raceways with internal joiners shall use a 25 percent wire fill cal- culation to determine the number of conductors permitted.
384.56 Splices and Taps. Splices and taps shall be permitted in raceways that are accessible after installation by having a removable cover. The conductors, including splices and taps, shall not fill the raceway to more than 75 percent of its area at that point. All splices and taps shall be made by approved methods.
384.60 Grounding. Strut-type channel raceway enclosures providing a transition to or from other wiring methods shall have a means for connecting an equipment grounding conductor. Strut-type channel raceways shall be permitted as an equipment grounding conductor in accordance with 250.118(13). Where a snap-fit metal cover for strut-type channel raceways is used to achieve electrical continuity in accordance with the listing, this cover shall not be permitted as the means for providing electrical continuity for a receptacle mounted in the cover.
III. Construction Specifications
384.100 Construction. Strut-type channel raceways and their accessories shall be of a construction that distin- guishes them from other raceways. Raceways and their elbows, couplings, and other fittings shall be designed such that the sections can be electrically and mechanically coupled together and installed without subjecting the wires to abrasion. They shall comply with 384.100(A), (B), and (C).
(A) Material. Raceways and accessories shall be formed of steel, stainless steel, or aluminum.
(B) Corrosion Protection. Steel raceways and accessories shall be protected against corrosion by galvanizing or by an organic coating.
FPN: Enamel and PVC coatings are examples of organic coatings that provide corrosion protection.
(C) Cover. Covers of strut-type channel raceways shall be either metallic or nonmetallic.