Water Supply & DistributionQuestion 33 of 360
A commercial building connects to a boiler that uses chemical additives and is served from the potable main. What premise-isolation protection does the code generally require at the service?
a.A reduced pressure principle assembly (RP) because the boiler chemicals are a high hazard
b.A single check valve
c.No isolation because boilers are exempt
d.A pressure regulator only
Explanation
A boiler treated with chemicals is a high (health) hazard with potential backpressure, so premise isolation generally requires a reduced pressure principle assembly (RP). A single check valve and a pressure regulator provide no adequate high-hazard protection, and boilers are not exempt from cross-connection control.
Law Reference: 2022 California Plumbing Code (CPC) §603.0Practice all 360 questions free — no signup required.
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