trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
  
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| Wiring multiple devices via a single piggyback fuse? |
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......Stupid question alert......
Can I wire a dash cam and 2 reversing cams via a single piggy back fuse plug. Literally connecting them via a block? Or do they all need to have their own?
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 13th Dec 2018 7:31 pm |
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Brian_DL13
Member Since: 25 Aug 2013
Location: Teesdale
Posts: 1418
 
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Depends entirely on what current they draw in total versus the fuse rating.
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| 13th Dec 2018 7:43 pm |
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trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
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Brian, thank you, that was my very next question. Do I add together the recommended fuses for each device or is there a more complex formula (my O level science is twitching!)
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| 13th Dec 2018 7:48 pm |
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Brian_DL13
Member Since: 25 Aug 2013
Location: Teesdale
Posts: 1418
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Statiistically, you'd not expect all 3 devices to draw max current at the same time. However, it's theoretically possible. SO you pays your money you takes your choice.
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| 13th Dec 2018 7:53 pm |
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trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
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They should all be live when the ignition is on. Would it be more sensible to put an inline fuse for each then?
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| 13th Dec 2018 7:59 pm |
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Brian_DL13
Member Since: 25 Aug 2013
Location: Teesdale
Posts: 1418
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Well it'd do no harm! And the cost would be minimal ...
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| 13th Dec 2018 8:03 pm |
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trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
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| 13th Dec 2018 8:09 pm |
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Russell
Member Since: 24 Aug 2007
Location: Kent
Posts: 10564
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Personally I would be looking to individually fuse them with the correct rating. However if you went down the piggy back route I would check what the maximum current draw is and then opt for a fuse of that rating and see what happens. the worst that could happen is the fuse blows and you have to put another in at a slightly high amperage. MY17 D5 1st Edition Namib Orange
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Tow bar, full length roof bars, side steps, tow bar storage unit, surround camers.
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| 13th Dec 2018 8:54 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
 
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I wouldn’t worry.
Them devices must draw a tiny amount.
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| 13th Dec 2018 9:33 pm |
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trailhound
Member Since: 27 Aug 2015
Location: Colchester
Posts: 697
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Pete K, that's kinda what I thought. I'll see what happens!
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| 13th Dec 2018 9:49 pm |
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RBB
Member Since: 19 Nov 2018
Location: Fife
Posts: 167
 
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Voltage is applied across a device, current drawn by it, the voltage is the ‘force’ if you like that pushes the electrons through the resistance of said device.... does that make sense?
The fuse is there to protect the device and wiring in case of a short to earth (-ve) which reduces the resistance therefore increasing the current.
Work out the max current drawn by the three devices and fuse slightly higher, in theory the fuse should be as close to the supply (+ve ) as possible.
Ohms law.... I= V/R. Or I= P/V.
I is current, R resistance, V voltage, P power
If one device fails and shorts and the current increases past the fuse rating the fuse will blow, takingout all three.... if that is an issue, fuse individually if one blows then the others will still work.
Hope that makes sense !!😀
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| 14th Dec 2018 9:12 am |
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