Can innerduct be used to separate control cables from power and instrumentation cables?
Can innerduct be used to separate control cables from power and instrumentation cables?
(OP)
I'm looking over a vendor's requirement to run a control cable to a piece of equipment. They are calling for the control cable to be separated physically from the power and instrumention cabling. It doesn't say by how much. I've seen innerduct used with fiber optic cabling inside conduits. Is another use of innerduct for the purpose I describe?
We have lots of cable tray installed that has a lot of spare space. We certainly don't want to have to spend the extra $$ to install cable tray barriers for one control cable. I thought of running the cable in an innerduct strapped to the inside bottom of the instrument tray...ok idea?
We have lots of cable tray installed that has a lot of spare space. We certainly don't want to have to spend the extra $$ to install cable tray barriers for one control cable. I thought of running the cable in an innerduct strapped to the inside bottom of the instrument tray...ok idea?






RE: Can innerduct be used to separate control cables from power and instrumentation cables?
RE: Can innerduct be used to separate control cables from power and instrumentation cables?
The other good reason for separation is safety. You need to separate power-limited, class 2, or class 3 circuits from circuits under 600V by 50 mm. That's in the NEC, UL508, and UL508a.
Best to you,
Goober Dave
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RE: Can innerduct be used to separate control cables from power and instrumentation cables?
If you're looking at a private company's specification, you should ask them if they would accept it.
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: Can innerduct be used to separate control cables from power and instrumentation cables?
We are using 12/C #14, 600V cable. There are 4 power loads (motors, heater) that require 480V that run to it too along the same route. It's all digital signals.
These motors are critical to the operation. The cable routes in new and existing cable trays between the first and second floor.
My question was about putting this into existing cable tray that is practically empty. Screwing in physical barriers would be costly. The new trays will have barriers in them.
If you've seen how cable tray ends up looking over the years - stuffed....it would make me feel better if this had a 2" innerduct or conduit around it to ensure the required separation.
RE: Can innerduct be used to separate control cables from power and instrumentation cables?
RE: Can innerduct be used to separate control cables from power and instrumentation cables?
David Baird
Sr Controls Designer
EET degree.
www.afctool.com