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Old 03-30-2012, 11:24 AM   #1
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supporting emt from 4s box


I'm sorry this isn't really a diy question but its electrical code none the less. I'm about to start lighting on the project I'm on. I was told to mirror what some other guys did in another section. They supported their 4 square box from a strut rack. They didn't want to build anything to support their emt within 3' of the box so they just attatched a bar hanger to the 4s box. The emt that goes in to the box is supported by that bar hanger. They claim its legal and I'm having a hard time buying in to it. They say the bar hanger is solid, therefore its legal

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Old 03-30-2012, 11:34 AM   #2
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supporting emt from 4s box


358.30(A) You are correct. The conduit should be strapped within 3' of the box. But your co-workers are doing something we all have done in the past.
Check the exception. Is this why they can do it?

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Old 03-30-2012, 12:50 PM   #3
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I dont have a codebook with me. Can you tell me what it says? Is that just where it says secure your pipe within 3' of the box? The pipe is supported. The pipe is supported by the bar hanger, the bar hanger is supported by the 4s box and the 4s box is supported by strut.

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Old 03-30-2012, 02:06 PM   #4
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I agree with John(shocking I know) but I'm sure it has be done that way, even if not compliant.

The execption states you can increase to 5' of unbroken pipe where structural members do not readily permit fastening witin 3'.
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Old 03-30-2012, 02:27 PM   #5
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I'm not asking about distance. I'm saying the pipe is litteraly supported from the 4s box. There is no ruling against this?

I wish I could take a picture but there are no cameras allowed unless you have a camera pass
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Old 03-30-2012, 03:23 PM   #6
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I think I can picture what you are describing and I don't see an inspector going for it if that is the only means of support within the first 5 feet.

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Old 03-30-2012, 04:11 PM   #7
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supporting emt from 4s box


Acording to this

Exception No. 1: Fastening of unbroken lengths shall be
permitted to be increased to a distance of 1.5 m (5 ft) where
structural members do not readily permit fastening within
900 mm (3 ft).

As long as the 4s is supported and the pipe within 5 feet it should be allowed.
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Old 03-30-2012, 08:21 PM   #8
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i drew a little picture. Should be able to figure out what i mean
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supporting emt from 4s box-emt-support.jpg  
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Old 03-30-2012, 08:30 PM   #9
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I have seen those.
It has a clamp on both sides of the box that attaches to the pipe.
I think caddy makes them.
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Old 03-30-2012, 08:34 PM   #10
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Check this out.
http://www.erico.com/products/CADDYc...ConHangers.asp
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Old 03-30-2012, 09:14 PM   #11
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Quote:
Originally Posted by jbfan View Post
Looking at that, I don't think they are using the product as intended. I think they are intended have their own support. I'm pretty sure for them to be legal the bracket would need to be mounted to the strut and then the box and pipe mounted to the caddy bracket
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Old 03-30-2012, 09:22 PM   #12
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If that bracket is not secured to the strut or the bar joist, then it isn't legal
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Old 03-30-2012, 10:43 PM   #13
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Caddy makes everything for just about any situation you can imagine...nice find.
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Old 03-30-2012, 10:43 PM   #14
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don't know what a bar joist is, but the caddy bracket is only supported by the 4s box.
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Old 03-30-2012, 11:04 PM   #15
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supporting emt from 4s box


What is the strut rack attached to? Sounds legal if the bar hanger and box are attached to the strut.

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