Fuse size - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 8 Old 05-30-2009, 05:16 PM Thread Starter
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Fuse size

Just put an Eastern Beaver fuse panel on my DL (shipped fast, well made, and easy to install!). My plans involve two power outlets (one on the handlebars and the other under the seat), heated grips, a voltmeter, and a stebel horn. The voltmeter and the horn I will wire right to the battery.

My question is how do I know what number fuse to use with each of the components? I know next to nothing about how much power these things need to run. Anybody using the same or similar components can tell me what number fuse you are using?

The handle bar power outlet will be used primarily for a GPS, while the under seat outlet will be for an air pump or whatever needs charging.
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post #2 of 8 Old 05-30-2009, 08:44 PM
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I don't remember what the stebel would need, but for the GPS, I would look at the manual and see what it says, use what they have in the specs.
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post #3 of 8 Old 05-30-2009, 08:57 PM
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I've used a 2amp fuse for the GPS. It takes very little, as does the voltmeter. A 10A will probably handle heated gear but a 15A would be fine. The Stebel can draw 13A so a 15A fuse could be marginal but would probably work fine as the draw is short timed. A pump is likely to draw a lot. Check the specs.

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post #4 of 8 Old 05-30-2009, 08:59 PM
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Choose the FUSE based on the maximum current on the circuit. Choose the WIRE based on 150% of the fuse rating.

10 amp circuit = ~15 amp fuse = ~22 amps wire ampacity (#16)

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post #5 of 8 Old 05-31-2009, 12:11 PM Thread Starter
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Thanks for the info!
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post #6 of 8 Old 06-05-2009, 07:21 PM
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Quote:
Originally Posted by SCraig View Post
Choose the FUSE based on the maximum current on the circuit. Choose the WIRE based on 150% of the fuse rating.

10 amp circuit = ~15 amp fuse = ~22 amps wire ampacity (#16)
The larger amp ratings are free air ratings. Most wiring runs in bundles that are protected from moisture and physical damage. This also means less cooling for the wires in question. This recommendation is too general. It really depends on the circuit being protected and the operating environment. Choosing the correct fuse for an application is amazingly complex.
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post #7 of 8 Old 06-05-2009, 07:37 PM
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Actually, "Enclosed" means in raceways (specifically conduit or wireways). Bundled wires are technically, I think, considered "Free Air" since they can dissipate heat to the atmosphere. I could be wrong about that though, it's been 25 years since I read through the electric codes. Wiring in conduit cannot dissipate heat, the conduit traps it in.

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post #8 of 8 Old 06-08-2009, 02:08 PM
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Quote:
Originally Posted by SCraig View Post
Actually, "Enclosed" means in raceways (specifically conduit or wireways). Bundled wires are technically, I think, considered "Free Air" since they can dissipate heat to the atmosphere. I could be wrong about that though, it's been 25 years since I read through the electric codes. Wiring in conduit cannot dissipate heat, the conduit traps it in.
Bundled wiring cannot be considered 'free air'. There is a reason that for example extension cords have different power ratings for being completely extended versus all rolled up. Try using your vacuum cleaner with the cord all rolled up versus completely extended, you will feel the difference, of course those cords are really getting too warm in any case.

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