Listed HDPE couduit types EPEC A, and EPEC B.

[tortuga]

Greetings all; 353.6 the NEC requires HDPE conduit and associated
fittings to be listed (to UL 651A).

I am currious what the use case is for EPEC A, and EPEC B HDPE conduit types?
Manufacturers call EPEC B "SDR 13.5" and EPEC A "SDR 15.5".
Why would I choose one of those over schedule 40 or 80?

Looking at the UL white book under HDPE (EAZX)

The conduit is intended for underground use under the following condi-
tion, as indicated in the Certification Mark: Direct burial with or without
being encased in concrete (HDPE Schedule 40, Schedule 80, EPEC A, EPEC
B).

So both A and B can be direct buried?
Is one or the other better for directional boring?

Looking at some spec sheets it appears SDR 13.5 is in-between schedule 40 and 80:
https://www.bdiky.com/siteadmin/inc...kcfinder/upload/files/UL Data Sheet 10-18.pdf

Thanks in advance.

 

[Cow]

I can't help you with your questions directly since I haven't used those types, but we use a fair amount of UL sch. 40 HDPE in open ditches.

Haven't used it for a boring job yet, even though that is one of the places HDPE really shines.

I'll be curious to hear the responses you get on your questions though.