Thor Forums

[Beau388]

[QUOTE So I am installing a second AC on my 29M. Here is what I am proposing to do, install 20 amp Park Power plug by the existing 30 amp plug, run a second 12 gauge cable to under the bed. Run 12 gauge cable from under bed up to where I will be installing the second AC. Hers's where i need your opinion, If I get a Progressive Industries EMS-HW50C can I run the 30 amp existing power through one leg of this and the 20 amp through the other leg? Does the 50 amp rating limit each leg to 25 amps?

I have looked at the Progressive Industries website but could not find any related info. Also sent them an email, but have not received a reply yet.

Thanks[/QUOTE]
The problem is what to do with the white wire in the 20 amp A/C circuit. The EMS-HW50C has three pass-through circuits L-1, L-2 and common. The entire case is grounded through a ground strap. Tying the two white cables is a no-no as it could be used as a return for one leg of the 50 amp circuits.



The 50 amp service is for a house and RV are the same. The service panel (circuit breaker panel) is where the difference occurs. With a home service panel where 240 volts is required, L-1 and L-2 are controlled by a single double ganged circuit breaker in the service panel and supply 240 volts to a device. If 120 volt service is also required by the same device, a fourth wire is added and known as a common. It provides for a return electrical path for either of the hot legs (L-1 and/or L-2) path In an RV, the service panel divides L-1 and L-2 into two separate 50 amp circuits each with its own common which are attached to a common buss-bar entirely separate from the ground buss-bar.


If you feel the need for an EMS in the separate 20 amp circuit, another 30 Amp EMS with a separate entry service box with a 20 amp circuit breaker would be the way to go.