Since a home's metal plumbing was often used as the ground for its electrical system, if you install plastic pipe somewhere you must make sure that you haven't accidentally disconnected the ground. To reduce such errors, the National Electrical Code requires that in new construction, if the ground connection is made to a water pipe, it must be made within a few feet of the point where the pipe enters the building.
Name of resin | Uses | inch- based |
metric |
---|---|---|---|
polyvinyl chloride | PVC | PVC-U | |
chlorinated polyvinyl chloride | CPVC | PVC-C | |
acrylonitrile-butadiene-styrene | ABS | ||
high density polyethylene | HDPE | ||
cross-linked polyethylene | PEX | ||
polybutylene | No longer used in residential plumbing. |
PB | |
polyethylene (PE) | |||
rubber-modified styrene (SR) | |||
polypropylene (PP) | |||
polyacetal |
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Last revised: 11 August 2011.