Adiabatic Equation
- Thread starter ml1936
- Start date
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Using the equation S=root(I²t) / K
Assuming you mean PEFC as in prospective earth fault current?
For a copper earthing conductor, table 54.2, K=143
At 1300A, a BS 1361 will disconnect in approx 0.3s
So for a protective conductor the minimum size required is calculated by root (1300² x 0.3) / 143 = 4.97mm
For the meter tails - 10mm isn't suitable for a 100A supply, need to be 25mm so may effect your PEFC when they are replaced!
Better to stick to table 54.7 imho.
Assuming you mean PEFC as in prospective earth fault current?
For a copper earthing conductor, table 54.2, K=143
At 1300A, a BS 1361 will disconnect in approx 0.3s
So for a protective conductor the minimum size required is calculated by root (1300² x 0.3) / 143 = 4.97mm
For the meter tails - 10mm isn't suitable for a 100A supply, need to be 25mm so may effect your PEFC when they are replaced!
Better to stick to table 54.7 imho.
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Use t of 0.1s, if you want a more accurate time then you'll need to reference manufacturers data.
EDIT - beaten to the punch (like Chuck Liddell on Sunday morning if you watch UFC!)
EDIT - beaten to the punch (like Chuck Liddell on Sunday morning if you watch UFC!)
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