gadfly56
Senior Member
- Location
- New Jersey
- Occupation
- Professional Engineer, Fire & Life Safety
This one is new for me. One of our salesmen sold a water detection system design/install to a customer. They have a very wet basement (~12 sump pumps) and wanted early warning if the pumps fail or are overwhelmed. The installation manual suggests 18-26 AWG with a maximum resistance of 50 ohms for each sensor run. The sensor "bugs" sit directly on the floor. The product is by Sensaphone. Although the specs don't say the transformer is Class 2 or 3, the input is 120 VAC at 6W. I'm thinking power limited wiring methods here, which negates a lot of chapter 3 in the NEC. However, I'm looking for suggestions which will produce an installation that is reasonably trouble-free as far as wiring in a wet location for power limited. Your advice is greatly appreciated.