Don't forget to weigh in considerations for into, through, and from hazardous locations.BRV said:
We - chemical industry - are using cable trays exclusively. Even for the equipment, control station drops from the main cable tray runs we are utilizing wirebasket, rather than conduit. Use TC-ER rated cable for 480V stuff and CLX or MC for MV installation.BRV said:
So you run sections of the wire frame tray down to the equipment? How does it stand up in a factory envrioment? Most of those products that I have seen seem to be designed for commerical use.
I vote for cable tray. Makes it a whole lot easier to add/fix later on. Cost wise it is probably a wash.BRV said:
346.10(7) can?t find it.rbalex said:Don,
Beginning with the 1993 NEC cycle, review the development of what is now 346.10(7). After you have read the full development, I do not believe you will find one valid safety argument in the TCR/TDCs and their predecessors for the restrictions placed even today on what is now TC-ER in Section 346.10(7).
I actually happen to know a potentially valid one but the major opponents to using TC-ER as an open wiring method don?t want to use it since it would also affect their product. Those of us that are proponents have pretty much given up ? we?re getting too old to fight. Maybe Laszlo would like to take up the gauntlet.
BTW I happen to believe Laszlo?s application sounds just fine.
Abuse - fire them. They put their fellow workers at risk.don_resqcapt19 said:Bob,
I will take a look at the ROPs and ROCs for that section when I have some time. My only objection to exposed cables to the equipment is based on how I see things getting treated by the plant operators. Even my rigid conduit is often damaged...I just don't see how cable and tray would stand up to the abuse that I often see. And I get paid by the hour...rigid conduit in a Classified area is very labor intensive
Hey, knock yourself out....don_resqcapt19 said:Actually, not too far from me, conduit is required in the house and the garage by the local codes.
do you ever hang other things from them? I often see air lines and such strung along under them. I guess under them is not in them so it does not violate the wording of the code.weressl said:Cable tray installation offer significant cost savings in many applications.