WAC 296-96-02560
What are the requirements for
submersible pumps or sumps? Sump pumps and drains are not
required in elevator pits. Sump holes must be installed and
measure a minimum of eighteen inches by eighteen inches by
eighteen inches. If drains or sump pumps are installed, they
must not be directly connected to sewers and/or storm drains.
P-traps and check valves are not allowed. All installations
must meet the NEC and all plumbing codes. Drains meeting the
above requirements may be installed in lieu of sump holes.
Sump hole covers must be designed to withstand a load of
three hundred pounds per square foot.
EXEMPTION:
Residential elevators, vertical platform lifts, and special purpose lifts are exempt from this section.