Fixtures & Water HeatersQuestion 209 of 360
A lavatory or sink is required to have an overflow only when:
a.it is made of stainless steel
b.it serves a commercial kitchen
c.it is set on a pedestal
d.the fixture design includes one; where provided, it must connect on the fixture side of the trap
Explanation
Not every fixture must have an overflow, but where a fixture is furnished with one, the overflow passage must connect to the fixture side of the trap so its water is renewed and sealed. An overflow that connects on the sewer side would bypass the trap seal. The overflow must be designed so it cannot cause cross-contamination.
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