Discuss max volt drop to sub board in the Electrical Forum area at ElectriciansForums.net

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what would you guys do if you where doing the job rather just be told thanks tho i do appreciate you guys helping me and no iam not just ignoring the volt drop sorry i ment to reply to you mate

I'd start by giving the customer an estimated cost before spending much time designing it as most people will be put off by the price of doing it properly.
I'd also be exploring other options instead of running a 137 metre single phase circuit.
 
I think you would be looking at 35mm² and with lighting 50mm² without C factors in the mix buried or clipped.
 
Does lighting still need to be 3% v.d if using led ?, thought some leds had a operational voltage between two values (say 200v - 240v). I Might be wrong about that but do seem to recall something along those lines in another discussion a while ago.
 
The requirement according to BS7671 is 3%. The type of installed fittings is not relevant.
 

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