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I'm just starting a job and in the spec. it states to come out of the slab with pvc coated grc. But from there I have to use rigid aluminum. Is it o.k. to connect the two different metals together? It also says in the spec to keep the aluminum isolated from other metals with plastic sleeves or plastic coated hangers. What are your all thoughts?
 

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I agree with your concerns.

What kind of project is it that they want you to use aluminum conduit?
 

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I'm just starting a job and in the spec. it states to come out of the slab with pvc coated grc. But from there I have to use rigid aluminum. Is it o.k. to connect the two different metals together? It also says in the spec to keep the aluminum isolated from other metals with plastic sleeves or plastic coated hangers. What are your all thoughts?
The bare threads are now, not coated. The oxide on the surface of the aluminum will cause a reaction.
 

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buddhakii said:
It's a water pumping station. I use it quite a bit in water and waste water industry. Price is pretty comparable to grc but it's sucks to work with. Come home covered in black oil everyday.
It's great to work with. Weighs almost nothing.... You're going to be oily anyways threading GRC all day
 
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