osiris42
Member
- Location
- Denver, CO
Long time listener, first time post-er.
An electrical contractor has raised a question regarding the suitability of single conductor (300kCMIL) in cable tray within a Class I, Division 2 location.
We initially ran the single conductor instead of multiconductor as the 3/C is often difficult to manage in these sizes and rare to find in a 300kCMIL size (the equipment lugs could not handle 350kCMIL, and could not be changed out). Article 392 indicates that single conductor cable over 1/0 AWG is suitable for installation in tray as long as labeled as suitable for use with tray, but section 501.10 indicates that only types PLTC, PLTC-ER, ITC, ITC-ER, MC, MV or TC bay be installed in division 2 hazardous locations.
The 1/C cable is "CT" rated (Suitable for use in Cable Tray), but I don't think it is possible to have a TC rating for a single conductor cable since article 336 defines TC rated cable as "A factory assembly of two or more insulated conductors..."
I always took CT as the same as TC, but by the letter of the code, I can now see they are not really the same.
I have been doing these types of installations for many years, and so have many of my colleagues and this is the first time this has come up. Has anyone come across this before?
Thanks in advance for any sage like wisdom here...
An electrical contractor has raised a question regarding the suitability of single conductor (300kCMIL) in cable tray within a Class I, Division 2 location.
We initially ran the single conductor instead of multiconductor as the 3/C is often difficult to manage in these sizes and rare to find in a 300kCMIL size (the equipment lugs could not handle 350kCMIL, and could not be changed out). Article 392 indicates that single conductor cable over 1/0 AWG is suitable for installation in tray as long as labeled as suitable for use with tray, but section 501.10 indicates that only types PLTC, PLTC-ER, ITC, ITC-ER, MC, MV or TC bay be installed in division 2 hazardous locations.
The 1/C cable is "CT" rated (Suitable for use in Cable Tray), but I don't think it is possible to have a TC rating for a single conductor cable since article 336 defines TC rated cable as "A factory assembly of two or more insulated conductors..."
I always took CT as the same as TC, but by the letter of the code, I can now see they are not really the same.
I have been doing these types of installations for many years, and so have many of my colleagues and this is the first time this has come up. Has anyone come across this before?
Thanks in advance for any sage like wisdom here...