Aluminum Sleeve?

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RETRAINDAILY

Senior Member
Location
PHX, arizona
I have 3-112.5 KVA transformers the secondaries are 350's.

I need too penetrate a 2hr wall I was thinking I should be able to use a
1" aluminum Ridged Sleeve, strut strapped to My pipe rack.
Put 3-#2 GEC's in it and not have too deal with bonding the sleeve.

This sound compliant?:-?
 

eprice

Senior Member
Location
Utah
I have 3-112.5 KVA transformers the secondaries are 350's.

I need too penetrate a 2hr wall I was thinking I should be able to use a
1" aluminum Ridged Sleeve, strut strapped to My pipe rack.
Put 3-#2 GEC's in it and not have too deal with bonding the sleeve.

This sound compliant?:-?

I think your question is about the application of 250.64(E), correct? If so, the requirement to bond the ends of the sleeve to the GEC's does not apply because aluminum is non-ferrous.

But installing the GEC's in the sleeve may not suffice for maintaining the integrity of the 2-hr wall. The building code requires a tested assembly when penetrating a rated wall. Unless you can find a reference showing that your proposed arrangement has been tested and qualifies as a 2-hr fire stop assembly, you haven't met the building code. I always recommend contacting 3M or another manufacturer of fire stop materials. They can give you specifications for tested through penetration fire stop assemblies.
 

RETRAINDAILY

Senior Member
Location
PHX, arizona
thank you.

I did find something on 3M site that looks like it would work.
In the plastic penetration area.

If I just ran a 1" RMC, put all 3 in it,
would I need too bond all 3 conductors at both ends ?

After reading 250.64(e) a few times ..I'm not sure.
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
thank you.

I did find something on 3M site that looks like it would work.
In the plastic penetration area.

If I just ran a 1" RMC, put all 3 in it,
would I need too bond all 3 conductors at both ends ?

After reading 250.64(e) a few times ..I'm not sure.
Yes you would need to bond both ends if the sleeve is ferrous. The bond needs to be the same size as the GEC.
 
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