Join Date: Aug 2006
Location: Arlington, VA
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Re: 50A Splitters/ Dual 30A Shore Power
One more caution:
Be VERY VERY careful when using a splitter such as the Marinco 152AY or 153AY to feed two 30A inlets from a single 50A shorepower plug. Each of these 30A legs is protected by a 50A breaker in the power post on the dock, NOT a 30A breaker, so it's possible to pull upwards of 50 amps thru EACH of these 30A legs if your boat isn't wired correctly with 30A breakers for each.
Moreover, as we've seen in the past and from MaineSail's recent long and excellent post, 30A connectors cannot really carry 30A continuous. They are actually 20A connectors which the industry pushed to have rated at "30A intermittent".
So, be very careful not to try to pull more than about 20-22A continuous thru these connectors. A pure resistive continuous load of only 25A -- such as two 1,500 watt electric heaters -- could easily cause these connectors to burn. You see them frequently in virtually any marina you visit.