For a building where sewage must be pumped and continuity of service is essential (such as public use), the CPC generally requires…

Giải thích

Where interruption of pumping would create a health hazard, such as buildings used by the public, duplex pumps are required so that a standby unit takes over if one fails. The pumps typically alternate and can run together during peak flow. A single pump risks a sewage backup during any failure.