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Seattle City Light
MATERIAL STANDARD
standard number:
superseding:
effective date:
page:
7015.05
April 23, 2009
June 19, 2009
1 of 5
standards coordinator standards supervisor unit director
John Shipek John Shipek Pamela S. Johnson
SCHEDULE 40 PVC CONDUIT AND FITTINGS
1. Scope
This material standard covers the requirements for
Schedule 40 extruded rigid PVC (polyvinyl chloride)
conduit and fittings consisting of elbows, couplings,
adapters.
The requirements for Schedule 80 PVC conduit and
fittings are located in Material Standard 7020.05.
2. Application
Schedule 40 PVC conduit and fittings are used to
construct smooth raceways for the pulling in of cable
installed in a variety of looped radial and network system
applications:
• Service
• Secondary
• Primary
• Communication
• Control
Schedule 40 PVC conduit is not appropriate for riser pole
applications.
Design engineers should be aware that different types of
conduit have widely different physical properties that
affect their application.
For new construction, design engineers are directed to
utilize the following standard trade sizes (IPS):
1/2 in
3/4 in
2 in
3 in
4 in
2. Application, continued
Design engineers should gravitate away from utilizing
these trade sizes (IPS):
1 in
1-1/4 in
1-1/2 in
2-1/2 in
3-1/2 in
6 in
Five inch (IPS) size conduit is a special case.
Historically, at Seattle City Light, it has been widely
used for new, primary construction, however, recently,
5 inch IPS fiberglass conduit, Material Standard
7025.05, has been selected to be the new standard
for this application.
Five inch (IPS) size conduit is specified with both
ends straight cut to minimize the gap at the conduit
joints. Minimized gaps are less likely to catch debris
during construction and lead to damaged cable.
Refer to Design Standard 9220.05 for more information
matching conduit with cable and application.
Elbows are also known as bends. Large radius elbows
are also known as sweeps.
For the purpose of this standard, 5 degree angle
couplings shall be considered elbows.
The straight cut end of a section of conduit or elbow is
also known as the spigot end.
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