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DOCK POWER QUESTION?

Old 01-22-2007, 04:33 PM
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Default DOCK POWER QUESTION?

Hope yall can help with this one. Boat has 50 amp service, dock has 30 cant run every
thing on boat, got to be AMP coservative. Would I benefit by plugging into the docks two 30's, (via splitter) to my 50 on boat?




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Old 01-22-2007, 04:43 PM
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Default RE: DOCK POWER QUESTION?

try in the boating forum.these people here dont know nuthin.dockside chat is not really dock stuff per say
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Old 01-22-2007, 04:44 PM
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Default Re: DOCK POWER QUESTION?

Are you asking about plugging two plugs into to different sockets on the dock and connecting them to one power cable going to the boat?
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Old 01-22-2007, 04:49 PM
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Default Re: DOCK POWER QUESTION?

Yes two 30s into one 50.
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Old 01-22-2007, 04:53 PM
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Default Re: DOCK POWER QUESTION?

Marinco is the company that makes all of the adapters. I don't believe that you can combine 2 power sources into 1. You can split 1 source into 2 connections



http://www.marinco.com/scpt/brandSearches.php?currentMarketName=Marinco%20Shor e%20Power&currentSection=Shore%20Power%20Adapters& currentSubsection="Y"%20Adapters

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Old 01-22-2007, 04:56 PM
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Default Re: DOCK POWER QUESTION?

I don't think they make such an adaptor. ???

Also, the two female sockets on the dock could be from two different phases. If they are, and you tied them to the cord going to the boat... It would cause a short and not work...

If they are not two different phases, they will be considered parallel conductors and one may (will) hog most if not all the load...

I think it would be wise to get someone to look at what you have...
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Old 01-22-2007, 05:04 PM
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Default Re: DOCK POWER QUESTION?

Reason being, the two 30s on the the dock are monitored by the same meter thats why the bucking phases thing didnt seeem like a problem. Ill have to look inside and see if there fed from same power source so i wont get bucking fried!
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Old 01-22-2007, 05:23 PM
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Default Re: DOCK POWER QUESTION?

fishstix36 - 1/22/2007 5:04 PM

so i wont get bucking fried!
This is beyond my comprehension of electrical contracting.

What I do know, however, is that was funny.
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Old 01-22-2007, 05:24 PM
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Default Re: DOCK POWER QUESTION?

Hate to see you turn into a fishtix

You can check with a volt meter. If you get 240 socket to socket you would turn into a fishtix. If zero they are the same phase....
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Old 01-22-2007, 05:26 PM
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Default Re: DOCK POWER QUESTION?

Even if they are phased out correctly, they don't make the adapter

You could make one yourself. The marina probably wouldn't approve

Can you replace the conductors and receptacle to make one of the 30's a 50 ? The conduits on my dock are large enough and several have been converted



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Old 01-22-2007, 07:50 PM
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Default Re: DOCK POWER QUESTION?

install a 50 amp service.

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Old 01-22-2007, 09:01 PM
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Default Re: DOCK POWER QUESTION?

They do make it. It's called a reverse Y adapter. Not cheap - approx $475

http://www.marinco.com/scpt/ProdPage...0Shore%20Power
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Old 01-22-2007, 09:09 PM
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Default Re: DOCK POWER QUESTION?

They also cover the same/differant phase converstion issues. Not cheap but I was looking at much larger adaptors. I was looking at the Atlas line for the problem we were solving. It's a common event I was told. The worst part I found out was bad wiring on the dock side is your enemy. It should be inspected prior to hook up on overnight docks.

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Old 01-23-2007, 01:21 AM
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Default Re: DOCK POWER QUESTION?

30 amps is 30 amps regardless of what time of day you check it.

IMO the only way you could do what you want to do safely is separate the power needs on your boat to two separate outlets/ circuits, then run two separate feeds to the boat, one for each outlet. This will work without issue as long as one individual power draw on the boat isn't a 50 amp draw!

Remember what makes a 30 amp circuit generally isn't the breaker or fuse in the panel, its the wire size that feeds the panel that holds the breaker of fuse or the wire size that comes out of the panel which feeds the outlet! If you try to up the draw from your 30 amp breaker/ fuse to 50 amps chances are you will have an electrical fire somewhere!

My suggestion would be to run a new 60 amp service to the dock and call it the day!
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Old 01-23-2007, 08:14 AM
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Default Re: DOCK POWER QUESTION?

Elusive's got it right.

Not an electrician by trade, but I believe the standard requires different "plugs" for different amperages. So what I am saying is that each outlet on the pedestal should reveal the amperage (and voltage for that matter). On reason is so that someone doesn't plug a 50 amp power requirement into a 30 amp service.


For example if there are 2 outlets that accept the 30 amp cord, there should be 60 amps in total going to pedestal or pedestal side. You could also check the breakers on the pedestal which will be imprinted with the amperage. (This is assuming of course that the marina has the correct wiring.) What Elusive said regarding the marinco reverse adapter/converter is the way to go. It is expensive-that's due to the "box" where the wires connect-but you need it to get the job done.
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Old 01-23-2007, 08:55 AM
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Default Re: DOCK POWER QUESTION?

chrisjb - 1/23/2007 9:14 AM

For example if there are 2 outlets that accept the 30 amp cord, there should be 60 amps in total going to pedestal or pedestal side.
Wrong!

The product below can not step up 30 amps to 60 amps! It can only give the user two supplies of 15 amps!

You can NOT double up two 30 amp circuits to supply a single 60 amp need, as soon as you try to double up the two separate 30 amp circuits together you'll BLOW a breaker or fuse! That would be a direct short! Given the amperage involved, you could possibly start a fire from the short! So don't even try it!!!!!!!!!!!!!!! If not, seriously fry the wires feeding the circuit!!!

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Old 01-23-2007, 09:34 AM
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Default Re: DOCK POWER QUESTION?

Garett - 1/23/2007 8:55 AM

Wrong!

The product below can not step up 30 amps to 60 amps! It can only give the user two supplies of 15 amps!

You can NOT double up two 30 amp circuits to supply a single 60 amp need, as soon as you try to double up the two separate 30 amp circuits together you'll BLOW a breaker or fuse! That would be a direct short! Given the amperage involved, you could possibly start a fire from the short! So don't even try it!!!!!!!!!!!!!!! If not, seriously fry the wires feeding the circuit!!!
Not true

The adapter parallels the two 30A connections providing one 50A connection


http://www.marinco.com/docs/inst/201023.pdf

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Old 01-23-2007, 09:49 AM
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Default Re: DOCK POWER QUESTION?

Ahh, I knew I would get blasted for the post.

The above picture is not the product. There is another one specifically designed to handle the 2 30 to 1 50 situation. Box is much bigger and I believe it even had LEDs on it - if not marinco, then hubble. Personally have been involved in its use on about half a dozen boats in the same dilemma and is becoming more common as boats are going towards the single 50 versus dual 30's.

.....Just looked it up. Hubbell YQ230- "The intelligent power solution. This adapter safely powers a 50A/125/250V boat from two 30A/125V receptacles at dockside. Construction is heavy-duty, and this adapter is "smart" - if it senses reverse polarity, it shuts off." (Has a safety indicator light)....$299 in 2006 Consumer Marine Cat.

I agree 100% that you can't just wire 2 30's together by simple connections and get 50. I should either a) stop while I'm ahead, or b) restate the comment that there is 60 amps available for use on that side. (all assuming that the pedestal has been wired correctly from the service feed.)
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Old 01-23-2007, 12:47 PM
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Default Re: DOCK POWER QUESTION?

Elusive - 1/23/2007 10:34 AM

Garett - 1/23/2007 8:55 AM

Wrong!

The product below can not step up 30 amps to 60 amps! It can only give the user two supplies of 15 amps!

You can NOT double up two 30 amp circuits to supply a single 60 amp need, as soon as you try to double up the two separate 30 amp circuits together you'll BLOW a breaker or fuse! That would be a direct short! Given the amperage involved, you could possibly start a fire from the short! So don't even try it!!!!!!!!!!!!!!! If not, seriously fry the wires feeding the circuit!!!
Not true

The adapter parallels the two 30A connections providing one 50A connection


http://www.marinco.com/docs/inst/201023.pdf
Interesting, I stand corrected.
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Old 01-23-2007, 01:17 PM
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Default Re: DOCK POWER QUESTION?

Besides all of the arguing about feeding two 30-amps circuits into a single 50a or 60a circuit…you also have the issue of the USCG requirement, your marina’s insurance, and your boat’s insurance.

REQUIREMENT: within 10-ft of where the shore power comes into the vessel there must be a mains breaker rated equal to the shore power circuit. If you have 30-amps shore power, you are REQUIRED to have a 30-amp breaker on your boat within 10-ft of where that shore power comes into the vessel. I have no idea how you deal with bridging 30’s on shore for your mains on the vessel. I'm presuming that since the source(s) from shore are on 30a breakers you would be required to a 30a breaker on your boat.
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