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what size fuse to use.


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kassdog 
Copper - Posts: 257
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Joined: March 09, 2007
Location: United States
Posted: April 17, 2014 at 3:51 PM / IP Logged  
So getting ready to figure out fuse sizes for running new wire on this Porsche kit car.
When figuring amperage it watts/volts. So if my bulbs for the headlights are 55/60watts the my amperage is worse case 5.5 amps and 6 amps.
For some reason I've always assumed headlights had a higher amperage rating.
Then using a wire gauge chart I should be fine running 16ga for my headlights. Just trying to get someone to back up my numbers.
the12volt 
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Joined: March 07, 2002
Location: Louisiana, United States
Posted: April 17, 2014 at 4:19 PM / IP Logged  
You should always fuse for the wire and not the lights or any other component. Have another peek here:
https://www.the12volt.com/wiring/recwirsz.asp
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the12volt 
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Joined: March 07, 2002
Location: Louisiana, United States
Posted: April 17, 2014 at 4:35 PM / IP Logged  
BTW, I should have said "You should always fuse for the smallest wire in your circuit and not the lights or any other component..." 
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howie ll 
Pot Metal - Posts: 16,466
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Joined: January 09, 2007
Location: United Kingdom
Posted: April 18, 2014 at 1:52 AM / IP Logged  
Incidentally there will be extra power consumption via relays etc, so bump that 6 amps to 10.
Back in the (audio) day if an amp carried a 30 amp body fuse, we placed a 40 amp at the battery end.
Also rate your wiring for the load there are charts available if you Google wire gauges or similar.
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: April 18, 2014 at 7:46 PM / IP Logged  
And fuses - like cables & relays etc - should generally only be run at up to ~70% of their rating. (But some components are underrated to begin with...)

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