Bryan Newport
Member
I am looking for any references- NEC, EIA-TIA, etc. concerning the mounting height of cable tray from a ceiling grid.
Thanks-
Thanks-
Cable tray installation
- Thread starter Bryan Newport
- Start date
- Status
rcarroll
Senior Member
- Location
- Fort Collins, Colorado
NEC article 392 covers cable trays
NEC isn't going to give you any guidance in reference to mounting height. Since you mention EIA-TIA, I assume you are looking for the telephone industry. Each telephone company has their own standards. Most follow Bellcore NEBS GR-63-CORE, however there are always exceptions
Gennerally speaking equipment aisle cable trays are installed @ 7'-2" AFF, X-aisle @ 8'-2" AFF, and power-misc @ 9'-2" AFF
Gennerally speaking equipment aisle cable trays are installed @ 7'-2" AFF, X-aisle @ 8'-2" AFF, and power-misc @ 9'-2" AFF
Bryan Newport
Member
Cable tray
Cable tray
We are installing 2 different trays for power and data distribution in a data center. There is a finished drop ceiling, and the trays will be installed below that.
Cable tray
We are installing 2 different trays for power and data distribution in a data center. There is a finished drop ceiling, and the trays will be installed below that.
- Location
- Illinois
- Occupation
- retired electrician
I think that OSHA requires 7' of clearance for any area that is a walkway.
Don
Don
Bryan Newport
Member
Cable tray
Cable tray
Most of the tray will be installed above network racks, and there will be a few crossover points that will pass over the walkway to connect the rows . We are >8' AFF with all of the trays. Our concern is if there is a minimum distance from the ceiling tiles. Is there a difference between these clearances for power and data trays?
Cable tray
Most of the tray will be installed above network racks, and there will be a few crossover points that will pass over the walkway to connect the rows . We are >8' AFF with all of the trays. Our concern is if there is a minimum distance from the ceiling tiles. Is there a difference between these clearances for power and data trays?
Re: Cable tray
Re: Cable tray
Most telephone and data companies prefer to seperate power, signal, data, and bonding conductors having seperate raceways. How we go about it is somewhat a trade secret.
Re: Cable tray
You are going to have to answer your own question. It comes down to leaving enough clearance for installers to run cables. I-foot is the industry standard and more is better.Bryan Newport said:
Most telephone and data companies prefer to seperate power, signal, data, and bonding conductors having seperate raceways. How we go about it is somewhat a trade secret.
Bryan Newport
Member
cable tray
cable tray
I am a union journeyman electrician, have managed/worked on many data center projects, and I am fairly good with the NEC, but I could not find the info I was looking for. What I meant by the difference in clearances between data and power trays was in reference to the spacing from the ceiling. The customer requested the trays be installed side by side with spacing between, but we may install the data tray at a different elevation, so that the crossovers can be installed on the same plane as the main runs, instead of using a waterfall. The install height is limited by the rack height. I was just looking for any reference in the NEC that I might have missed. We had planned on a 12" minimum, but we wanted to be sure. I don't like to give away trade secrets either, and I would never expect or ask anyone else to. Thanks to Dereck and everyone for the advice.
cable tray
I am a union journeyman electrician, have managed/worked on many data center projects, and I am fairly good with the NEC, but I could not find the info I was looking for. What I meant by the difference in clearances between data and power trays was in reference to the spacing from the ceiling. The customer requested the trays be installed side by side with spacing between, but we may install the data tray at a different elevation, so that the crossovers can be installed on the same plane as the main runs, instead of using a waterfall. The install height is limited by the rack height. I was just looking for any reference in the NEC that I might have missed. We had planned on a 12" minimum, but we wanted to be sure. I don't like to give away trade secrets either, and I would never expect or ask anyone else to. Thanks to Dereck and everyone for the advice.
- Status