UL 651A

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These requirements cover:

1. Type EB and Type A extruded rigid PVC (polyvinyl chloride) electrical conduit and fittings consisting of elbows and other bends made from and for use with these types of conduit.
2. Extruded rigid Schedule 40 high-density PE (polyethylene) electrical conduit and the following fittings:

1. Elbows and other bends from and for use with this conduit and
2. Rigid high-density PE couplings for use with this conduit.

The designations "Type EB", "Type A", and "Schedule 40" refer to USA trade sizes of conduit having iron-pipe size outside diameters and specific wall thicknesses.

The PVC and PE conduit and fittings mentioned in are intended for use at 50C (122F) and lower ambient temperatures. Type A PVC conduit and fittings and Schedule 40 PE conduit and fittings are intended for use with 75C (167F) wiring. Type A and Type EB PVC conduit and fittings, where encased in concrete in trenches outside of buildings, may be used with 90C (194F) wiring. Schedule 40 PE conduit and fittings, where directly buried or encased in concrete in trenches outside of buildings, may be used with 90C (194F) wiring.

The conduit and fittings covered in these requirements are intended for use as rigid nonmetallic raceway for wires and cables in accordance with the National Electrical Code.