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breaker needed for battery charger

Old 10-27-2006, 09:26 PM
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Default breaker needed for battery charger

The survey indicated a double pole breaker should be installed for the battery charger.
Is there a surface mount double pole 15 A, AC unit available?
I checked the West Marine catalog but was unsure if it is a surface mount. (Blue Sea)
I brought this up because of others interested in installing a charging system as well.
thanks
BH
Old 10-28-2006, 08:27 AM
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Default Re: breaker needed for battery charger

I don't understand the need for a double pole breaker. Breaking the hot lead will disconnect the circuit properly.

The Blue Seas surface mount breakers are for DC only. They do make 2P AC breakers, but not surface mounted.

What is the explanation for this recommendation ?

Old 10-28-2006, 09:27 AM
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Default Re: breaker needed for battery charger

Is the battery charger the only AC item on the boat? If it is, there might be some confusion in the surveyor's wording. ABYC generally has set the standards for wiring as approved by CG. I have ABYC's compliance guide as of 2002 and the only place I see where they require a dual pole breaker is where the the shore power coming into the boat.

The breaker you are looking at is probably designed to be mounted in an ac panel. Go to blue sea's website-they will have what you are looking at there along with installation instructions that could be helpful. Off the top of my head, I know they make surface mount dc breakers but I don't think they make surface mount ac breakers.

Old 10-29-2006, 12:24 PM
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Default Re: breaker needed for battery charger

chrisjb - 10/29/2006 6:27 AM

... the only place I see where they require a dual pole breaker is where the the shore power coming into the boat.
Bingo! The mains breaker must be 2-pole. But the mains breaker must also be sized to match the shorepower supply; i.e. 30-amp showpower receptacle requires a 30-amp mains breaker, etc, so a 15-amp breaker would not have been recommended as a shorepower mains breakers, unless...

Since we are talking a 15-amp breaker it is possible a sub circuit breaker is needed (and can be singe pole) unless there are no other ac circuits on the boat, then you want/need a 15-amp double-pole ac breaker to facilitating a connection to a typical household receptacle that’s on shore.

I believe Blue Sea Systems is re-branding breakers made by Carling.

http://www.carlingtech.com

Airpax is another source of quality circuit breakers.

http://www.airpax.net

Old 10-29-2006, 01:25 PM
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Default RE: breaker needed for battery charger

The reasoning for the double pole was in case the shore power cord was not phased correctly, both wires will be protected. There is no other AC power on the boat, only a power line to a three bank battery charger. I am not certain that it must be a 15 A but that is what was discussed during the survey. I will need to contact the surveyer and clarify the size of breaker required.

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