Industrial applications
- Thread starter loucan40
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bphgravity
Senior Member
- Location
- Florida
Re: Industrial applications
Article 358.20 states the smallest allowed EMT is trade size 1/2. I dont not know of any exceptions to this that would require a larger minimum size.
As a matter of fact, Article 430.145(B) allows trade size 3/8 for this application only, which would be readily found in an industrial location.
FYI: There is a proposal for a new Article for the 2005 NEC, "409 - Industrial Control Panels."
Article 358.20 states the smallest allowed EMT is trade size 1/2. I dont not know of any exceptions to this that would require a larger minimum size.
As a matter of fact, Article 430.145(B) allows trade size 3/8 for this application only, which would be readily found in an industrial location.
FYI: There is a proposal for a new Article for the 2005 NEC, "409 - Industrial Control Panels."
This realy has nothing to do with the question, but I thought I would pass it on anyway.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Industrial applications
You won't find it in the NEC as it is not there. 3/4" is a common minimum size in specs, which are used because of some special application.
You won't find it in the NEC as it is not there. 3/4" is a common minimum size in specs, which are used because of some special application.
Re: Industrial applications
I'll jump in here too. The 3/4" minimum is a common engineering specification, but as stated by the others, it is not a code issue unless the "fill calculations" come in to play.
I do have a problem in some respect to this being specked when 1/2" inch will suffice. This is added expense to the customer not to mention wasting natural resources.
One more observation, in most "industrial" applications RMC or IMC is the norm.
Roger
I'll jump in here too. The 3/4" minimum is a common engineering specification, but as stated by the others, it is not a code issue unless the "fill calculations" come in to play.
I do have a problem in some respect to this being specked when 1/2" inch will suffice. This is added expense to the customer not to mention wasting natural resources.
One more observation, in most "industrial" applications RMC or IMC is the norm.
Roger
- Location
- Illinois
- Occupation
- retired electrician
Re: Industrial applications
If you bend 1/2" rigid or IMC on a mechanical bender in the 1/2" shoe, it is almost impossible to pull the wire. I agree that there are many cases where 1/2" is fine for the application, but if possible you should bend it on the 3/4" shoe.
Don
If you bend 1/2" rigid or IMC on a mechanical bender in the 1/2" shoe, it is almost impossible to pull the wire. I agree that there are many cases where 1/2" is fine for the application, but if possible you should bend it on the 3/4" shoe.
Don
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