REVISIONS TO STANDARD UL651A
UL651A is the Standard for Safety for "Schedule 40 and 80 High Density Polyethylene (HDPE) Conduit" and applies
to coilable smooth-wall continuous length HDPE electrical conduit. Originally published in 1981, several revisions
have reflected technical improvements in covered products.
In 2016 an important revision was approved to revise Table 9.3 "Load for crush test". While this table provided
values for testing HDPE conduit deflection loads, the values did not reflect the capabilities of today's high-performance
HDPE conduit. Therefore, a team of PPI experts in HDPE conduit and materials proposed a revised Table 9.3 to
the UL651 Standards Technical Panel, which was approved in June.
The revised Table 9.3 "Minimum Deflection Load for HDPE Specimens" utilizes a more deliberate methodology to
specify minimum conduit deflection loads, which are proportional for all sizes of HDPE conduit from trade
sizes 1/2 to 6. Deflection load testing is in accordance with ASTM Test Method D2412.
The revised version of UL651A was announced on June 24, 2016. It is anticipated that this will lead to
certification of new HDPE conduit products in the coming months, increasing choices for specifiers and users alike.
Access all UL standards directly at www.ul.com
Access UL651A at http://www.comm-2000.com/
Note: UL no longer updates the "Effective Date" for new and revised requirements within existing standards.
Therefore, the latest edition of UL651A still shows as "Fifth Edition - October 26, 2011" even though it contains these new revisions added in June 2016.