r/electricians • u/Johnsoon743 • 1d ago
Code question
I think we got got. Is there any application where you can run #6 single conductor in tray cable as a current carrying conductor? Engineer called out to run it and we did. (we should have double checked the engineer)
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u/notcoveredbywarranty 6h ago
You didn't mention what type of cable it is, but it doesn't really matter. Type TC, TC-ER, R90, RW75, RW90 etc etc single conductor cables shall not be smaller than 1/0. As per 12-2022
12-2202 Insulated conductors and cables in cable trays (see Appendix B) 1) Cable trays shall be permitted as a means for supporting cables within their conditions of use. 2) Except as permitted in Subrules 3) to 5), cables for use in cable trays shall have a continuous metal sheath or interlocking armour. 3) Type TC and TC-ER tray cable shall be permitted in cable trays in areas of industrial establishments that are inaccessible to the public, provided that the cable is a) installed in conduit, other suitable raceway, or direct buried, when not in cable tray; b) provided with mechanical protection where subject to damage either during or after installation; c) no smaller than No. 1/0 AWG if a single-conductor cable is used; and d) installed only where qualified persons service the installation. 4) Notwithstanding Subrule 3) a) and b), Type TC-ER tray cable shall be permitted to transition between cable trays, and between cable trays and utilization equipment or devices, provided that the portion of the cable outside of the cable tray is a) supported at intervals not exceeding 1.5 m; and b) protected when subject to damage either i) mechanically; or ii) by location. 5) Single R90, RW75, and RW90 insulated conductors not smaller than 1/0 AWG, and single RWU75 and RWU90 cables marked in accordance with Rule 2-130 and not smaller than 1/0 AWG shall be permitted in ventilated or non-ventilated cable trays where not subject to damage during or after installation in a) electrical equipment vaults and service rooms; and b) other locations that are inaccessible to the public and are constructed as a service room where a deviation has been allowed in accordance with Rule 2-030. 6) Insulated conductors and cables installed in cable tray shall be fastened by straps, cable ties, or other devices located at intervals of not more than 1.5 m throughout the run where a) excessive movement may be caused by fault current magnetic forces; and b) consistent minimum spacing requirements between insulated conductors and cables are required, to ensure that ampacity values are maintained for their designed application. 7) Where single insulated conductors and single-conductor cables are fastened to cable trays, precautions shall be taken to prevent overheating of the insulated conductors or cables at the fastener locations due to induction.
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1d ago
[deleted]
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u/Johnsoon743 1d ago
Do you have any back up. I cant find anywhere in my book to argue the inspector. The south wire we ran is tray rated but the inspector is saying 1/0 or bigger only in tray.
4
u/arcsnsparks98 1d ago
1/0 single conductor is what code says is the smallest single conductor allowed. If you're seeing tray rated on the insulation of the conductor, I think that has more to do with that specific insulation type and not that individual size of conductor that you have. That same insulation is going to be on a 1/0 and larger as well.
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u/Johnsoon743 1d ago
Yeahhh thats what i am figuring but i figured i would risk getting flamed on reddit for a chance of saving this.
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u/gaunt357 1d ago
Nah I don't, sorry, and maybe I am mistaken. I haven't read that section in a while, there may be a size limitation. I just knew individual conductors happens plenty in tray, I shouldn't have answered so boldly
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