Discuss Submain swa size check in the UK Electrical Forum area at ElectriciansForums.net
Very rough calculation whilst sat on my sun lounger next to the pool.....If the earth leakage relay was set to o.8xIn then 50V/50A=1 Ohm
Gives you a bit of room to play with if your taking Ze at 0.35 Ohms.
If your calculations are using 63A as Iz then i recon your looking at using around 150mm based on volt drop.
I got the mV/A/m figure from a manufacturers data sheet. Good point about to 50A setting....I just assumed they did. I've fitted one with a 30A max setting before.Can you get an earth leakage trip with a 50A tripping current? I've never yet seen them go above 10A
What are you basing your VD calculation on?
My rough calculations based on voltage drop come out at 2x50mm in parallel, based on a mobile phone mast not including any lighting requirements and not having any specified voltage limits stricter than 6%
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