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Can someone check my wiring maths please?
- Thread starter Critical Mick
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Sirus
Your all Banned except me
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Sirus
Your all Banned except me
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yes"
ya big dick
Wernt that your nickname at school?
lerk
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PFC has everything to do with it... otherwise we would be wiring ring mains in 70mm cable to deal with fault currents wouldn't we!
Take a look at the wiring loom in your car and tell me how many 2.5mm and above cables you can find - other than main battery connections and starter motor!
I ain't getting into a dick measuring contest though, so we'll leave the OP to make his own mind up shall we...
IanFiTheDwarf
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that's just running loads nothing to do with fault conditions which is what your fuse is for.
Power factor only rears its head with inductive loads in ac circuits so no concern in a car and not much concern in the home either as most inductive loads are fairly small.
As long as your cable is rated above the fuse and the fuse above the load then alls well. In domestic wiring you have volt drops in the cables due to length and de-rating due to insulation and disconnect times to worry about but not in a car.
lerk
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PFC = Prospective Fault Current... why would I be talking about Power Factor Correction on a DC Circuit???? :doh:
The PFC for a ring main is hundreds of Amps so by your reckoning we need to fit the 70mm or above cable as it will see the fault current for a few milliseconds, in practice this is not necessary as current ratings for cables are for constant draw of that current.
The PFC for a ring main is hundreds of Amps so by your reckoning we need to fit the 70mm or above cable as it will see the fault current for a few milliseconds, in practice this is not necessary as current ratings for cables are for constant draw of that current.
IanFiTheDwarf
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no you have misunderstood me, i agree with you here.
blue beasty
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lerk
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so shirley you can then say that any fault current on the cable will be high enough to ensure that the fuse will blow before any damage occurs to the lower rated cable???
IanFiTheDwarf
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in domestic wiring yes but in a car i dought it. 10A cable and 25A fuse is a long way apart and blade fuses are ****e
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