wire sizes?

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AtTheBrink
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wire sizes?

Post by AtTheBrink » Tue Aug 13, 2013 10:43 pm

What size wire do you guys recommend for the following,

1) LED nav lights in the bow
2) LED stern light
3) 1500 gph bilge pump
4) LED courtesy lighting

I am pretty sure thats it. Would 16ga work on all the LED's since they are such a low power draw? And I am thinking 12ga for the bilge pump? I am not too saavy on electrical stuff and I need to make an order of wire and switches. Genuinedealz.com has the best prices I have seen. I am planning on using the duplex boat cable for all the wiring to keep it clean and easy to identify wires. For switches I am getting the Carling switches from that same site. Any wiring or electrical advice is welcome!
Last edited by AtTheBrink on Wed Aug 14, 2013 12:38 am, edited 1 time in total.


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Boater45
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Re: wire sizes?

Post by Boater45 » Tue Aug 13, 2013 10:52 pm

Mike,

16 GA is fine for the LED lights, very low voltage and current draw. For the bilge pump I used 14 GA tinned bilge pump cable from Genuinedealz.com (http://www.genuinedealz.com/Marine-Tinn ... rchSize=12)
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Re: wire sizes?

Post by Lung Boy » Thu Aug 15, 2013 10:54 am

Mike,

You could google "12 volt wire sizing chart". There are several charts in internet space that can help you calculate what you need. Here is an example: http://www.affordable-solar.com/Learnin ... ire-sizing

Also if you wanted to increase your electrical saavy there is a book "The 12 Volt Doctor's Practical Handbook" that is good. Actually found a PDF version of an old edition online by googling the book title. Not sure if it is legal.

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Re: wire sizes?

Post by jacquesmm » Thu Aug 15, 2013 11:11 am

We sell that book:
http://www.bateau.com/proddetail.php?prod=SPA002

I have used it since more than 30 years: simple, easy to understand and it will answer all your questions about DC wiring in a small boat.

We supply a basic diagram with our plans but wiring is really up to the builder: except for a battery switch and a bilge pump, not two boat owners want the same setup.
That book is a great reference for drawing your own DC layout.
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AtTheBrink
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Re: wire sizes?

Post by AtTheBrink » Thu Aug 15, 2013 7:50 pm

jacquesmm wrote:We sell that book:
http://www.bateau.com/proddetail.php?prod=SPA002

I have used it since more than 30 years: simple, easy to understand and it will answer all your questions about DC wiring in a small boat.

We supply a basic diagram with our plans but wiring is really up to the builder: except for a battery switch and a bilge pump, not two boat owners want the same setup.
That book is a great reference for drawing your own DC layout.
The FS18 plans I got did not include the small boat electrical diagram.
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Re: wire sizes?

Post by majorgator » Fri Aug 16, 2013 6:15 am

Boater45 is right on. I used #12 AWG on my bilge, simply because that's what I had.
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Re: wire sizes?

Post by adrock1 » Fri Aug 16, 2013 1:40 pm

AtTheBrink wrote:
jacquesmm wrote:We sell that book:
http://www.bateau.com/proddetail.php?prod=SPA002

I have used it since more than 30 years: simple, easy to understand and it will answer all your questions about DC wiring in a small boat.

We supply a basic diagram with our plans but wiring is really up to the builder: except for a battery switch and a bilge pump, not two boat owners want the same setup.
That book is a great reference for drawing your own DC layout.
The FS18 plans I got did not include the small boat electrical diagram.
Same here. I got a set of RB16 plans that have nothing on wiring. I wish they did because electrical is foreign to me. I need all the help I can get. I'm gonna have to get a book.

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Re: wire sizes?

Post by jacquesmm » Fri Aug 16, 2013 1:55 pm

The FS18 is so simple that we do not include it. We should for the RB16.
It is somewhere at this web site but I can't find it.
It was a simple PDF file.
If I don't find it, I will post a new copy on Monday but don't expect too much.
We show: battery, switch, bilge pump, connections to lights and accessories through a simple breaker panel.
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Cracker Larry
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Re: wire sizes?

Post by Cracker Larry » Fri Aug 16, 2013 2:01 pm

Here is a diagram I drew for someone a while back, if this helps.

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Re: wire sizes?

Post by jacquesmm » Fri Aug 16, 2013 2:04 pm

Yes, that's it except that I never used a fuse between battery and switch.
All small boats just run a heavy (6 AWG ) positive and negative cable from the battery to a fuse panel/ terminal strip with a switch in between and from the panel/strip, you go to all your electrical equipment.

Thank you for posting the drawing.

Here is a link to standard color codes, copied from the ABYC book:

http://newboatbuilders.com/pages/elect5.html

The engine wiring is separate. That's usually a harness. I always connect the + of the engine to the battery switch but some people don't.

For some electronics and generally in larger boats, a grounding plate is required but that is never need for boats like the FS18 or RB16.
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