The only way that can possibly work with an isolation transformer is if:
Not on my boat. 50 amp is also 3 prong. With the smart adapter, I get 50 amp service, but will trip the pedestal is I try to use more than 2 A/C units.
Be careful with that arrangement - That dock circuit breaker trips (obviously) at 50 amps; so, all of the devices including wiring must be rated to 50 amps minimum to the next circuit breaker in line. Power cords and connections rated at 30 amps will not trip the 50 amp circuit breaker when at their maximum capability and can be a fire hazard....
Just to add some clarification. That 50/125 setup is a single 50 amp leg, split across 2 - 30 Amp boat circuits. Splitting at the dock with a Marinco 152AY will trip at the dock once the boat pulls a sum total of 50 amps (its all on the same circuit).
Hmm - I thought that Steve S was talking about those rare 50 amp 125 volt single line circuits ("three prong receptacles" as he states). Agree, most marine installations are either 50 Amp 125/250 volt two line and/or 30 amp 125 volt single line. The 50 Amp 125/250 volt receptacles have three blades and grounded outer shell (essentially 4 conductors). It is very common to split the 50 amp 125/250 volt into two 125 volt feeds to the boat.
Yes that is the correct adapter. There is a catch however.
Yes that is the correct adapter. There is a catch however.
The two 30 amp receptacles on the dock must be out of phase which I've seen and not seen depending upon the marina.
To find out if it is out of phase measure the voltage between the HOT sockets across both receptacles. If you get between 220V and 240V it is out of phase and will work. If you get 0V they are in phase and will not work on your boat.
If they are in phase and your boat does not have an isolation transformer then your 120V circuits will work but the 220V stuff will not. If you have an isolation transformer and the circuits are in phase you will be completely SOL.
Yes that is the correct adapter. There is a catch however.
The two 30 amp receptacles on the dock must be out of phase (sometimes called "split phase") which I've seen and not seen depending upon the marina.
To find out if it is out of phase measure the voltage between the HOT sockets across both receptacles. If you get between 220V and 240V it is out of phase and will work. If you get 0V they are in phase and will not work on your boat.
If they are in phase and your boat does not have an isolation transformer then your 120V circuits will work but the 220V stuff will not. If you have an isolation transformer and the circuits are in phase you will be completely SOL.
