On Tuesday, January 31, 2017 at 10:54:36 AM UTC-5, dpb wrote:
On 01/31/2017 7:34 AM, wrote:
...

We want to know what is defence between water pipe and electrical conduit pipe.

'Pends on the Standard to which is certified--same PVC product may be
have multiple ratings & markings i.e. PVC Sch. 40 & EPC 40.

Pressure testing & rating at standard temps for the plumbing products,
low tolerance lead/chemical leaching contamination to potable standards
(D1785 & D2265).

Some mfg's manufacture some PVC products that are dually tested and
labeled/marked & NSF certified ASTM D1785/ASTM D2265/NEMA TC-2/UL 651

Probably biggest difference is most/all(?) of the EPC products are rated
for UV exposure whereas most/all(?) plumbing products aren't. This is
important for outside applications where conduit may be in sun.

But, if markings are obliterated it's impossible to tell apart visually,
dimensions are same for each size/schedule between the two.

All the plumbing PVC I've seen is white, all the electrical grey.
Seems you could very easily visually spot something out of place.
What color is that dual use stuff?