ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Do we need grounding?
by gfretwell - 04/06/24 08:32 PM
UL 508A SPACING
by tortuga - 03/30/24 07:39 PM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
0 members (), 376 guests, and 7 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#77115 04/27/01 10:39 AM
Joined: Nov 2000
Posts: 2,236
Likes: 1
Member
Can one use metal pipe straps with PVC conduit?

I see this a lot, and I was wondering.

Something tells me "no", but I've haven't found it in or near 347-5 through 9...


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

#77116 04/27/01 03:13 PM
Joined: Oct 2000
Posts: 4,116
Likes: 4
Member
'66,

I've never heard anything against using them. I would consider using them if I needed strong support and corrosion was not a concern. They would have to be the right size which would be for rigid (GRC) trade sizes not thinwall (Emt) sizes.

Was there something that you didn't like about using metal straps?

[Linked Image]
Bill


Bill
#77117 04/27/01 08:42 PM
Joined: Oct 2000
Posts: 5,392
S
Member
Well no!
I did a 400A 500 cu kcmil 3ph riser in 4" Sch 80 a while ago. Used beeline & 4" conduit clips every 24" .
The steel clips do not allow for the expansion of pvc, and are not listed for it's use.
But the plastic clips are whimpy, and this riser's 4-500's wieghed out to more than they are rated for!
Me....I'd rather see the pvc pull apart than fall off the building [Linked Image]


[This message has been edited by sparky (edited 04-27-2001).]

#77118 04/27/01 09:06 PM
Joined: Nov 2000
Posts: 2,236
Likes: 1
Member
I've always preferred using metal straps, but lately I've been learning a lot about a few of my assumptions about the NEC, and I had a feeling there was something hiding somewhere to prevent their use if they manufactured PVC straps.

Sparky has a good point about the expasion thing... I usually use 1 hole GRC straps...
Any difference here?


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
#77119 04/28/01 06:35 AM
Joined: Oct 2000
Posts: 5,392
S
Member
Virgil;
try the 'quick-clips' for the small stuff. they live up to their name, quick...snap your pipe right in, comes out easy if needed, maintains the 1/4" standoff in wet/damp locations. I snap a line first....

[Linked Image]

#77120 04/28/01 08:14 AM
Joined: Dec 2000
Posts: 4,294
Member
I got called on metal straps once @ the beach because of the salt air, but can't imagine why they would cause a problem elsewhere. The code requires expansion joints where more than 1/4" of linear expansion is expected, and the diametric expansion can't be all that great. And yes, those PVC straps are whimpy.


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5