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Honda ST1100 Section => Electrics & Electronics - Volts, Amps and Fuses ST1100 => Topic started by: Diesel on September 28, 2012, 08:27:05 AM

Title: Which Gauge Wire / Amperage to use?
Post by: Diesel on September 28, 2012, 08:27:05 AM

How do I know which grade of wire and fuses to use for a certain device?

Is its rating marked somewhere on the casing?

And if it says "draws 15A" - do I put a 20A fuse on 20A/30A wire?

Cheers, Diesel

Title: Re: Which Gauge Wire / Amperage to use?
Post by: Brock on September 28, 2012, 09:24:44 AM

Yes

Title: Re: Which Gauge Wire / Amperage to use?
Post by: ruSTyEB on September 29, 2012, 09:19:15 AM

Devices max draw should be up to 75% of fuse.  This is because a fuse can still blow after time (due to heat factors) even if lower than rated fuse. Eg 95% load may blow in 30-60 mins depending on ambient temp.  100% in a minute or so.

You want your fuse rated lower than the wire rating, so if there is a fault, the fuse blows before the wire melts.

Title: Re: Which Gauge Wire / Amperage to use?
Post by: saaz on September 29, 2012, 01:01:34 PM

Check to see if the 'device' has a peak power draw followed by a more constant power draw (eg HIDs)