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Volt drop at the intake - Just looking to compare with sunny Thailand.

crossy
A nice easy one.


On a "standard" UK domestic supply what sort of volt drop would you expect at the intake for a load of 50A?


In an urban environment and in a rural environment.


We are dropping about 30V (from a nominal 220V) at 50A, of course the other loads in the village may already have pulled things down to 205V!!

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    the engineer did an earth loop test which showed an impedance of 0.238 ohms don't know if 5his is a typical reading for a domestic intake whatever there would be a lot of amps in a short circuit fault. Let's hope that never happens

    Sounds reasonable to me. Mine was about 0.15 last time I measured it - I'd guess anything between 0.1 and 0.3 would be fairly common.


    In theory the fault current could be a lot higher - the DNOs say it can be anything up to 16,000A for a single phase supply! (Hence UK CUs having a (conditional) 16kA rating).


       - Andy.
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    the engineer did an earth loop test which showed an impedance of 0.238 ohms don't know if 5his is a typical reading for a domestic intake whatever there would be a lot of amps in a short circuit fault. Let's hope that never happens

    Sounds reasonable to me. Mine was about 0.15 last time I measured it - I'd guess anything between 0.1 and 0.3 would be fairly common.


    In theory the fault current could be a lot higher - the DNOs say it can be anything up to 16,000A for a single phase supply! (Hence UK CUs having a (conditional) 16kA rating).


       - Andy.
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