Is a 50 Amp to 30 Amp splitter safe? - SailNet Community

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Old 09-18-2013
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Question Is a 50 Amp to 30 Amp splitter safe?

I will admit up front I am not very good with electricity...must be some childhood trauma...lol

I am moving my boat to a different marina. The slip they have offered has a single 50 Amp pedestal.The boat is running dual 30 Amp cords now. Can I simply use a 50 Amp to dual 30 Amp y connector and be fine?

Thanks in advance.
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Old 09-18-2013
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Re: Is a 50 Amp to 30 Amp splitter safe?

SHouldn't be a problem as long as your total amp draw does not exceed 50 amps. Otherwise you trip the dock.

I have been using one for a while.

If you start tripping, just turn off your microwave when using the water heater or if you have the option to alternate your A/C cycling so both compressors don't kick on at the same time, that would help too.

Brian
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Old 09-18-2013
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Re: Is a 50 Amp to 30 Amp splitter safe?

The only issue is that between the splitter and the breaker in the boat there is a 30 amp wire protected by a 50 amp fuse. As a result you could draw 35 or 40 amps over that leg (as long as the total of both legs is below 50 amps) and likely scorch the connections at the boat fitting. If you regularly use a splitter you should inspect the disassembled connections periodically.
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Old 09-19-2013
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Re: Is a 50 Amp to 30 Amp splitter safe?

SVA, you are correct that the wire between the splitter and the boat is protected by a 50 amp breaker at the pedestal, it is also protected at the boat end by the boats 30 amp breaker. So unless there is a fault in the cable itself, there is never going to be an over current situation under normal circumstances. So using a splitter is fine.

Regardless, your suggestion to check all connections periodically is a good idea for everyone.
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Re: Is a 50 Amp to 30 Amp splitter safe?

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Originally Posted by ebs001 View Post
SVA, you are correct that the wire between the splitter and the boat is protected by a 50 amp breaker at the pedestal, it is also protected at the boat end by the boats 30 amp breaker. So unless there is a fault in the cable itself, there is never going to be an over current situation under normal circumstances. So using a splitter is fine.
Actually protection only exists upstream of a circuit element. Connections are the biggest issue. So if a salt encrusted boat connector (just as an example) provides a medium to high resistance connection between hot and neutral the connector will heat up and could begin to melt (I've seen this) without tripping the downstream breaker on the boat.

Splitters are a reasonable solution for a lot of people, including me, but they come with risks that we should be aware of.
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