Grid cielings

Status
Not open for further replies.
we call it seismic wire, that is shot in to the metal corregated roofs. its twisted at the top of the ceiling grid. i have used the twisted end to support mc cable, so that the mc is not touching the grid. i have also used the seismic wire to support up-to-1" emt conduit in places where strapping of any kind was impossible, a short 5-6 ft gap, in which the master electrician on the site advised me to do it but i had to wrap the seismic wire around the conduit three times or more. passed inspection.
 
Typical setup for a sheetrock ceiling, 5/16" rod, 1 1/2" iron and 7/8" "hat channel" or as we call it Chicago Bar. I have to say I've never seen two sections of iron joined that way. Usually they're overlapped and tied with tie wire.

NYC_Brooklyn-lippolis7249104.jpg
 
I think the real question here is, does 300.11 apply to these ceilings? Around here they normally use the same 9 gauge support wires that they use for a lay-in tile ceiling. Often the will use more of them because of the additional weight of the "hard" ceiling.
I think the intent of the code is that 300.11 applies only to lay-in tile ceilings, but the wording seems to apply to they type of ceiling being discussed in this thread. I will support conduit and boxes, assuming they are accessible, on the rods or wires that support the lathers channel, as well as on the channel itself.
 
Its looks like the same thing ive used in food factorys they dont use threaded rod .you have to thread the ends to put hangers up the rest of it is smooth. no threads showing..
 
Status
Not open for further replies.
Top