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Associate

Join Date: Sep 2009
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NEMA Standard for Rigid PVC (U-PVC) Conduit Bending Radius

07/06/2020 3:25 AM

Hi Everyone:

Can i request guidance for the exact NEMA Standard which narrates requirements for UPVC (Rigid PVC) Elbow Radius requirement (particularly 90 degree). The conduit itself is also UPVC (Rigid PVC).

I am not clear which one of these (or any at all) is applicable for RIGID PVC (not PVC):

NEMA TC 9

NEMA TC 3

NEMA TC6 & 8

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Guru

Join Date: Mar 2007
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#1

Re: NEMA Standard for Rigid PVC (U-PVC) Conduit Bending Radius

07/06/2020 4:06 AM

..."Unless otherwise specified, it is recommended that the elbow radius used in a raceway installation be a minimum of twelve times the diameter of the largest cable to be installed. The cable manufacturer's recommendations should be followed."...

http://www.heritageplastics.com/wp-content/uploads/2016/08/pvc-installation-instructions-nema-tcb2-2012.pdf

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Associate

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Location: United Arab Emirates, Abu Dhabi
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#2
In reply to #1

Re: NEMA Standard for Rigid PVC (U-PVC) Conduit Bending Radius

07/06/2020 10:01 PM

The FOC in conduit OD is 16.5mm and the Rigid PVC Conduit Size planned is 6inch (152.4) OD, with reference to TCB2 it seems that the 12 times dia of the FOC (largest cable) is in safe zone.

But, Client is asking why TC-9 bend (6 inch radius for 90 degree elbow 1220mm) not applicable?

We have 6 inch conduits UPVC (rigid PVC) with 12 sub conduits (Rigid PVC Material) within them (1 six inch conduit having 12 subconduits of 1 inch each) and the conduit Elbow Bending Radius of 914.4mm at 90 degrees angle. Conduit + Elbow are Concrete encased.

As per TC-9, the bending radius for this case is not adequate. Is NEMA TC-9 the correct standard to look into?

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Guru

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#3
In reply to #2

Re: NEMA Standard for Rigid PVC (U-PVC) Conduit Bending Radius

07/07/2020 12:37 AM

I think some of these standards list the absolute minimum required for code, and others list recommended sizes...so it's a decision made for the convenience of fit...If you are using proper lube and methods you shouldn't have any problems, and I would go with the recommended sizes, this leaves some leeway for field adjustment in tight spots if it becomes an issue...The wider the radius, the easier the pull...24" 30" 36" any will work...

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Anonymous Poster #1
#4

Re: NEMA Standard for Rigid PVC (U-PVC) Conduit Bending Radius

07/07/2020 7:10 AM
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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#5

Re: NEMA Standard for Rigid PVC (U-PVC) Conduit Bending Radius

07/08/2020 3:35 AM

Is the concern the <...bending radius...> or the bend radius? The question remains unanswered from the earlier thread on this topic.

It's surprising that this one hasn't so far been labelled as a duplicate thread.

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