NFPA 820, Table 4.2 indicates that a Residential Wastewater Pumping Station Wetwell is a Cass 1, Division 2 Location. If I specify Class 1, Division 2 rated submersible pumps, do I have to ventilate the wetwell or do I just have to use a Combustable Gas Detector(CGD)? If a CGD is used, does it have to be wired to the pump starters to cancel pump start if gas is detected?
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NFPA 820 CLASS 1, DIVISION 2 VENTILATION
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