Electrical / Insrumentation trays separation distance
Electrical / Insrumentation trays separation distance
(OP)
Hello everybody.
I looked over at NEC and didn't find an answer.
Please point me where to find this information, minimun separation distance between electrical (power, lighting, control) cables and instrumentation (F&G, service, J1, J2, J3, ESD, SIS, Telecom, etc) cables in above ground instalations (trays).
Thanks in advance.
Best Regards.
MARCO
I looked over at NEC and didn't find an answer.
Please point me where to find this information, minimun separation distance between electrical (power, lighting, control) cables and instrumentation (F&G, service, J1, J2, J3, ESD, SIS, Telecom, etc) cables in above ground instalations (trays).
Thanks in advance.
Best Regards.
MARCO





RE: Electrical / Insrumentation trays separation distance
Because of the various susceptibilities and noise sources that abound you won't find a Standard. You may find some corporate or industry guidelines or rules.
Search in here for "cables separation control".
Keith Cress
kcress - http://www.flaminsystems.com
RE: Electrical / Insrumentation trays separation distance
Anything over 1000V must be separated. Below that, you're on your own - use company standards or best practices.
The NEC does require that all cables in a common tray, conduit etc must be insulated up to the highest voltage in use. So if you run 480 V circuits in the tray, everything else must be insulated to that level.
But itsmoked is very correct - the NEC is mainly a fire prevention standard, not an installation specification.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: Electrical / Insrumentation trays separation distance
Roy
RE: Electrical / Insrumentation trays separation distance
The idea is not to run E&I cables in the same tray with a barrier but to use separate trays for each cable types but using the same support (same threaded rod in a hanging arrangement) and I don't know the separation distance between trays and since NEC doesn't have an answer I guess I'll just have to use 300 or 350mm.
Regards
RE: Electrical / Insrumentation trays separation distance
300 - 350 sounds OK, the trays need enough spacing so you can get your hands in to lay the cables
Roy
RE: Electrical / Insrumentation trays separation distance
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Electrical / Insrumentation trays separation distance
Regards.