RIGID NONMETALLIC UNDERGROUND
CONDUIT, PLASTIC (EAZX)
USE AND INSTALLATION
This category covers plastic types of rigid nonmetallic conduit, including
straight conduit, elbows and other bends, in sizes 1/2 to 6 (metric designators
16 to 155) inclusive, intended for installation underground as raceway
for wire and cable in accordance with Articles 352 and 353 of ANSI/NFPA
70, ??National Electrical Code?? (NEC). This conduit may be: (1) polyvinyl
chloride (PVC) Type A, Type EB or Schedule 40, or (2) high-density polyethylene
(HDPE) Schedule 40, Schedule 80, EPEC A, EPEC B. This conduit is
intended for installation and use in accordance with the following information.
The conduit is intended for underground use under the following conditions,
as indicated in the Listing Mark: (1) when laid with its entire length
in concrete in any location (Type A), (2) when laid with its entire length in
concrete in outdoor trenches (Type EB) and (3) direct burial with or without
being encased in concrete (HDPE Schedule 40, Schedule 80, EPEC A, EPEC
B or PVC Schedule 40). The conduit is intended for use in ambient temperatures
of 50?C or less.
Unless marked otherwise, Type A and HDPE Schedule 40, Schedule 80,
EPEC A, EPEC B conduit is intended for use with wire rated 75?C or less.
Type EB and Type A conduit, where encased in concrete in trenches outside
of buildings, may be used with wire rated 90?C or less. HDPE Schedule 40,
Schedule 80, EPEC A, EPEC B or PVC Schedule 40 conduit, when directly
buried or encased in concrete in trenches outside of buildings, may be used
with wire rated 90?C or less.
Where conduit emerges from underground installation, the wiring method
is intended to be of a type recognized by the NEC for the purpose.
PVC conduit is designed for joining with PVC couplings by the use of a
solvent-type cement. HDPE conduit is designed for joining by threaded couplings,
drive-on couplings, or a butt-fusing process. Instructions supplied by
the solvent-type cement manufacturer describe the method of assembly and
precautions to be followed.
Word of caution... SDR-11 is not recognized by UL.