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Discuss supply cable sizing in the Electrical Forum area at ElectriciansForums.net

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Hi ,I have a wood cabin outside 70mtrs from house incoming supply, I was thinking of using a 35mm 2core pvc/swa, as I think a TT system would be appropriate for the cabin, owing to the distance away from house load would be allowing for diversity would be 51amps, seems a lot but it will be a live in dwelling with all requirements for cooking heating etc,am i correct with supply size Thanks ron
 
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Strima

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What's your installation method, earthing arrangement, bonding requirements?
 

Spoon

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Why not 25mm on 50A.
 
  • Thread Starter Thread Starter
  • #4
What's your installation method, earthing arrangement, bonding requirements?
Earthing wood be as TT supply, ie stake in the ground at hut position' bonding as regs, sub circuits would be 6242y and sized, appropriate for circuits suplied
 
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  • #5
Earthing wood be as TT supply, ie stake in the ground at hut position' bonding as regs, sub circuits would be 6242y and sized, appropriate for circuits suplied
PVC/SWA would be buried in the earth at appropriate at depth
 

telectrix

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telectrix

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soz. misread the table as 1.65mV
 
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  • #9
PVC/SWA would be buried in the earth at appropriate at depth
my calcs as follows , volt drop table 4E4B 1.85mv/a/mt 35mm =1.35 x50ampsx70mtrs =4.72 volts . 25mm = 1.85mv/a/mt x50amp x70mtr= 6.47volts so not much lighting load so 5% of 230volt=11.5volts allowed and 3% of 230volt =6.9 volts so would the calc with 5% be okay which is 11.5 volts am I getting to tied up ronky
 

Strima

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Your volt drop needs to take into account the circuits within the cabin not just the distribution circuit.
 
T

Toneyz

Whilst cable size has been worked out to 25 or 35 due thought needs to be given to the terminal sizes and termination practicalities.
 
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