For a commercial space, the plumbing is primarily PEX. However, there are copper stubouts where the pipe comes out of the wall for connections. Most of these are just 6" stubouts supplying sinks and I don't believe any of them need to be bonded. However, there is one section of wall where there are four stubouts in a row, all cold water, and all four are ganged on copper pipe with sweat connections. Some will supply water to electrical appliances (e.g., icemaker), but none will be connected directly via conductive piping. The total length of the copper pipe in the wall connecting these four stubouts is ~6 feet. Would this pipe need to be bonded?
Also, there is a hot water copper stubout that feeds a handwashing station. Clipped onto this pipe is a Grundfos aquastat (thermostatic switch) for controlling the hot water recirculation pump. This is the switch:
There are two wires entering this aquastat; there is no ground. The switch is potted in epoxy, but the body that clips onto the copper pipe is steel. This aquastat is fed from a 120V/15A circuit that powers the recirculation pump. Since the copper stubout is supplied with water via PEX, there is no continuous bonding back to the building's water supply. For this reason, I think it would be prudent to bond this stubout. But can I just add a 14ga or 12ga bonding jumper from a clamp on the stubout to the electrical junction box where the aquastat lead is connected to the 14ga branch circuit leading back to the recirculation pump?
Also, there is a hot water copper stubout that feeds a handwashing station. Clipped onto this pipe is a Grundfos aquastat (thermostatic switch) for controlling the hot water recirculation pump. This is the switch:
There are two wires entering this aquastat; there is no ground. The switch is potted in epoxy, but the body that clips onto the copper pipe is steel. This aquastat is fed from a 120V/15A circuit that powers the recirculation pump. Since the copper stubout is supplied with water via PEX, there is no continuous bonding back to the building's water supply. For this reason, I think it would be prudent to bond this stubout. But can I just add a 14ga or 12ga bonding jumper from a clamp on the stubout to the electrical junction box where the aquastat lead is connected to the 14ga branch circuit leading back to the recirculation pump?
