Instrumentation Cable on Conduit and Cable Tray

[lpena]

I am currently working on a project that will use ITC cable on a Class I div 2 location. We proposed to only use cable tray for the instrumentation cable, but my customer wants to use a combination of metal conduit and cable tray. Does the NEC allow this? I was reading through 501.10, and I see that both options are mentioned, but not I am not sure if you can combine these for the same cable. They sent me a sketch of what they want us to do. Would this be OK? I'd appreciate your feedback. Thanks

 

[Saturn_Europa]

I am currently working on a project that will use ITC cable on a Class I div 2 location. We proposed to only use cable tray for the instrumentation cable, but my customer wants to use a combination of metal conduit and cable tray. Does the NEC allow this? I was reading through 501.10, and I see that both options are mentioned, but not I am not sure if you can combine these for the same cable. They sent me a sketch of what they want us to do. Would this be OK? I'd appreciate your feedback. Thanks

At my plant we have cable tray as main trunk lines through the building with conduit branching off for specific motors and equipment. We use aluminum conduit RAC and TC cable TC-ER. The building is Class II Div II.

 

[rbalex]

I am currently working on a project that will use ITC cable on a Class I div 2 location. We proposed to only use cable tray for the instrumentation cable, but my customer wants to use a combination of metal conduit and cable tray. Does the NEC allow this? I was reading through 501.10, and I see that both options are mentioned, but not I am not sure if you can combine these for the same cable. They sent me a sketch of what they want us to do. Would this be OK? I'd appreciate your feedback. Thanks

In Class I, Division 2, a given ITC cable run may be installed in a combined metal conduit and cable tray system; much as shown in you sketch. In fact, the sealing compound shown is pointless. While it isn't exactly consistent with your description, Section 501.15(B)(2) Exception No. 2 is conceptionally very similar except there is no boundary to cross. This is especially true if the entire cable run is in the same classified location.

In Class I, Division 2, ITC cable sealing requirements are installed under Section 501.15(E)(1)&(3). If you parse them both carefully you will probably find they don't need seals at all. You didn't mention what was in the J-box but if it's only terminals, no cable seals are needed there.