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Old 03 October 2017, 09:35   #1
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Help with simple wiring

I have replaced my four switch panel which had individual circuit breakers with a home made switch panel.
My thoughts were to keep it all dead simple, on/off with little joints, no circuit breakers etc..

I made up a Perspex panel and put in four waterproof toggle switches. I have the live feed with a waterproof 7.5 amp inline blade fuse onto the first toggle switch, then joining the other three toggle switches in series. I then decided to wire the anchor light, nav lights, deck light and manual side of bilge pump. I have not put in any waterproof blade fuses to any of these components.

All negative wires come back to a bus bar.

All works perfectly fine and was quite pleased with the outcome.

My problem being that if anything goes wrong, then the one and only fuse (7.5) will blow and all electrics will go out. Will/is this really such a problem.

Over the 13 years of having the rib, all my gremlins/problems with the electrics are not that the fuses have blown, just that the connectors have corroded or the circuit breakers have got wet or the bulbs bayonet fittings have corroded.

So have I gone too simple by just having the one fuse on the live feed?
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Old 03 October 2017, 09:55   #2
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It depends on the quality of your other wiring doesn't it? Are you likely to get a short circuit anywhere? Personally, I'd like to see each circuit fused separately, an easy way to do this would be to pop an inline fuse of sensible value into each switch input or output and change out the main fuse for a higher rating one.
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Old 03 October 2017, 11:01   #3
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I an easy way to do this would be to pop an inline fuse of sensible value into each switch input or output and change out the main fuse for a higher rating one.
+1.
Keep it simple but fuse each item separately. Even without a "short" something as simple as the cut tail end of a cable-tie getting into the bilge pump can jam it, load up the motor and pull more than 7.5amps.
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Old 03 October 2017, 12:32   #4
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I guess if you knew how many boat fires were caused by short cuts in wiring you would probably think otherwise. Personally I dont take any shortcuts here as I dont fancy trying long distance swimming if anything goes wrong.
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Old 03 October 2017, 13:07   #5
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OK thanks for your help. I guess I've been too simplistic and will attach a positive bus bar and take individual waterproof inline blade fuses to each toggle switch. Then upgrade my live inline fuse to say 20amp.

Would this be reasonable/safe.

Thanks
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Old 03 October 2017, 13:25   #6
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If you are using blade fuses I would suggest getting the LED type off eBay, these light up when they blow. This makes locating the faulty circuit child's play.
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Old 03 October 2017, 14:03   #7
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If you are using blade fuses I would suggest getting the LED type off eBay, these light up when they blow. This makes locating the faulty circuit child's play.
Available from Halfords too! I just installed a suite of them into an automotive box with clear perspex lid as a temporary measure.
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Old 03 October 2017, 14:11   #8
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Fuse Box With Common Power & Ground Buses 6-Way | 12 Volt Planet

Just doing mine and waiting for this to come so each item will be fused separately you can get them with LED warning light but no need for me you can see a blown fuse
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Old 03 October 2017, 16:43   #9
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....and will attach a positive bus bar ....

Would this be reasonable/safe.

Thanks
Personally I don't like positive buss bars simply because they are big and live! I'd let you off with a single pillar with eyelets on your fuse tails. If you can box it so much the better. If you're going for general purpose blade fuse holders, grease the blades well to seal them from moisture. Don't ask me how I know this to be a good thing!
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Old 03 October 2017, 17:30   #10
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Blue sea makes some cool breaker strips, breakers instead of fuses. I used those and really like it
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