Re: e.m.t. for support
Pierre,
In thinking about it more, I think you've touched on why 358.12(5) may exist: It's not because the EMT itself may be unsound, but because the mechanisms used to attach it to the boxes/fixtures may not be capable of supporting the weight imposed. If installed as a complete raceway, you would almost always have at least one support for every piece of EMT, so the couplings and connectors would never be bearing the total weight. Not so in this case.
If that is the logic the CMP used, then it doesn't make sense to cite someone for using it as supports from, as Iwire mentioned, truss to truss (or a similar design where connectors and couplings aren't integrally involved). However, since none of this is specifically clarified, I think an inspector would be within his/her rights to follow the letter of the law and enforce 358.12(5) as it is written.
This is why I'm curious about what the CMP was thinking.
-John
[ March 22, 2004, 02:02 AM: Message edited by: big john ]