falon

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falon

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2005 NEC 300.11 requires items above a grid ceiling to secured at both ends. wires from deck above supporting ac cable to the light fixtures and communications wire hung from hooks secured to the deck above. did you require them to be secured to the grid below? how would you comply with this article.
 
here is a graphic.

graphic.jpg
 
If you were to use pencil rod or something like that I don't require it to be secured at both ends, but if you use wires, then yes, doesn't really do any good to "secure" to something that is just going to flop around.

Many people get confused on "secured" vs "supported". Have guys tell me all the time that they don't have to secure the conduit by the box because there's a hole right there. Still need to secure it within either the 12" or 8" or 3' or whatever is required.
 
I'm curious how this code addition manifested. Was it to reduce the amount of additional weight that the initial grid wires would have to support?

I personally think a bunch of grid ceiling installers got together and proposed this because they got tired of us pulling their ceilings out of level.
:p
 
Stevareno said:
I'm curious how this code addition manifested. Was it to reduce the amount of additional weight that the initial grid wires would have to support?

I personally think a bunch of grid ceiling installers got together and proposed this because they got tired of us pulling their ceilings out of level.
:p
Click to expand...

That's actually exactly what happened. This all come's out of the t-bar standards.
 
jumper said:
Wasn't seismic activity a factor also?
Click to expand...

...and fire fighter's safety. If they have to take a ceiling down to look for the fire, they don't want to get caught up in all the cable rolling out of the opening.
 
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