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#175769 - 03/10/08 11:38 PM
Re: Screw in Conduit
[Re: Webmaster]
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renosteinke
Moderator
Registered: 01/22/05
Posts: 3062
Loc: Reno Nv USA
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An excellent example to post!
300.4(E) is a new section, that specifically states that pipe run under such decking be spaced at least 1 1/2" away from the decking. No one-hole straps, no mineralacs, no 'thin' strut .... standard strut is 1 5/8" deep.
Yet another change that caught me by surprise.
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#175773 - 03/11/08 05:34 AM
Re: Screw in Conduit
[Re: renosteinke]
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JohnJ0906
Member
Registered: 10/19/06
Posts: 65
Loc: Baltimore MD USA
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Just to add one thing: the screw didn't penetrate the conduit. However, if the conduit had been secured properly, it probably would have. As it was, it pushed the conduit away from the roof.
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#178734 - 06/10/08 12:53 PM
Re: Screw in Conduit
[Re: earlydean]
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junkcollector
Member
Registered: 04/15/07
Posts: 20
Loc: Central Minnesota
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My dad once told me about a story similar to this that happened at the factory he works at: When the building was getting a new roof, the roofers where screwing down some sort of foam with long screws. One of the screws went right into a 2 1/2 inch conduit encasing a 480 volt feeder. Ka-boom!
Luckily no one was injured.
The same building also has several conduits running on the ceiling (similar to the photo) that contain 4160 volt conductors.
Edited by junkcollector (06/10/08 12:54 PM)
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#178763 - 06/11/08 06:48 AM
Re: Screw in Conduit
[Re: junkcollector]
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SteveFehr
Member
Registered: 03/19/05
Posts: 890
Loc: Chesapeake, VA
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I don't think there's any question that 300.4(E) is justified!
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#179251 - 07/03/08 12:15 PM
Re: Screw in Conduit
[Re: gfretwell]
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WNYJim
Member
Registered: 06/06/02
Posts: 28
Loc: Rochester, NY, USA
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I was in a new building in Washington state recently and noticed the lack of conduit runs but several drops down to machines.
Looking closer I saw slots cut in the roof pan decking.
Conduit was laid into the valley of the roof decking before the board, tar and stone went on!
And I didn't have my camera with me.
Can you envision the problems they will have?
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