Existing conduit system

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eesonny

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There is an existing conduit system in our plant that is routed from a pipe rack tray system to grade and continues underground to our control room. The cables are multiconductor power and instrumentation circuits.
There is a new project working that will put the conduit that is routed underground in a Class 1 Division 1 area.
Do I have to remove the existing cable and install conduits seal at the hazardous boundary? Or since the cable dumps into a tray system are we okay?
Thanks,
Sonny
 
Re: Existing conduit system

I'm making the assumption that the new project is creating a change in area classification.

I'm still having a bit of a problem picturing the installation so take the following strictly as "educated" opinion. Conduits "at grade" for area classification transitions always need a seal. Second, tray alone is not a recognized wiring method in Division 1.

With a bit more description, I may be able to add more information.
 
Re: Existing conduit system

Again, I am now assuming the trays will be in Division 1; this alone is a violation unless the cables are intrinsically safe. The conduits must be sealed at grade even if they were.

You need the new classification to be documented per 500.4(A).
 
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