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Old 27 March 2008, 16:55   #1
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LED Nav Lights/ Resettable Fuse Board.

http://cgi.ebay.co.uk/Hella-Navi-led...QQcmdZViewItem

What's the verdict on these babies? Value/quality?
Also, resettable marine grade fuse boards, any good or am I better off with glass fuses?

http://cgi.ebay.co.uk/LED-MASTHEAD-N...QQcmdZViewItem

...and this?
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Old 27 March 2008, 17:28   #2
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Also, resettable marine grade fuse boards, any good or am I better off with glass fuses?
Be carefull with "resettable" stuff. they are circuit breakers that once popped change their rating. Just like the ones on your house. I like fuses.
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Old 27 March 2008, 17:31   #3
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I bought my LED nav light direct from Austrailia and only cost me 23 for the pair. Haven't used them yet, but see no reson why they won't be excellent and they're stainless covered ones too.

As for fuse board....Why?

All I've got is a switch panel with MCB's so I don't have to fiddle about with fuses and the like.
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Old 27 March 2008, 17:38   #4
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Yeah, I saw the 'Oz' items. Pretty good you reckon?
I have a tenant Sparky whom fits out superyachts here http://www.pendennis.com/. He advised resettable but then, it wouldn't exactly be exposed when buried in the engine room of a 80m Oil Gangsters plaything.
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Old 27 March 2008, 18:11   #5
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...they are circuit breakers that once popped change their rating. Just like the ones on your house.
Can you elaborate on this?
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Old 27 March 2008, 18:17   #6
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Can you elaborate on this?
Most electro mech. breakers are heat operated. After they have popped once the bi-metal strip ( I assume) takes on a different rating. A friend of mine works for the local power service and if called out fix a problem with a breaker they always replace it.
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Old 27 March 2008, 18:43   #7
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Most electro mech. breakers are heat operated. After they have popped once the bi-metal strip ( I assume) takes on a different rating. A friend of mine works for the local power service and if called out fix a problem with a breaker they always replace it.
so does the rating go up or down? if it goes up that would seem to be an unsafe design. if it goes down then you would expect the breaker to trip quicker next time, go down again and the problem to perpetuate. Their popularity suggests this cannot be a significant issue.

My understanding was the breakers in my house (which I think are fairly common) used both a thermal trip to cut out small continuous current overloads and an electromagnetic switch to activate an immediate very high overload (e.g. a short).

Is your friend changing breakers in someones house or on the electricity network? could it be that he is switching very high voltages/currents where the arcing inside the switch may damage the contacts? or perhaps the cost/inconvenience of having to return to a site/the power going down if the breaker is faulty makes it a cost effective precaution.

Sorry for drifting a bit Off Topic - but I think you were possibly doing circuit breakers a disservice - although how suitable they are on an open boat is a different question.
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Old 27 March 2008, 18:59   #8
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Quote:
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I bought my LED nav light direct from Austrailia and only cost me 23 for the pair. Haven't used them yet, but see no reson why they won't be excellent and they're stainless covered ones too.
Be careful of the 'stainless' ones because some are just chrome covers and go scabby pretty quick.
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Old 27 March 2008, 19:01   #9
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I suppose it depends on how often you expect something to trip. I didn't feel the cost or complexity of breaker switch panels to be worth it as there was more to go wrong and if a breaker popped it clogs you were stuck. At least a fuse has no moving parts and can be changed easily.
I like the small motor vehicle fuses rather than glass ones, they are easily available, marked for rating, easy to change and as long as they are kept dry seem to last.
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Old 27 March 2008, 20:35   #10
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or perhaps the cost/inconvenience of having to return to a site/the power going down if the breaker is faulty makes it a cost effective precaution.

Sorry for drifting a bit Off Topic - but I think you were possibly doing circuit breakers a disservice - although how suitable they are on an open boat is a different question.
My understanding is that the rating goes down ie. they get tired. You are probably correct about changing it to be on the safe side for economic reasons. perhaps I am a bit old fanshioned ; but there are many times I have spent a lot of time solving an electrical problem only to find out that the bloody breaker was popping; mainly working on swimming pool pumps. I like fuses. They are blown or not blown and no in between.
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