It wasn't new work, but an urgent need to restore supplies after a thunderstorm, which led to the earth fault.
The board man refused to replace the fuse again (I don't blame him) until we'd found and isolated the fault.
Our installation dept (in those days) always went the next size up in conductor sizes than were necessary.
More recently I had cause to query why they had 2.5mm² backed up with a 300a fuse. They produced figures to support the use (short circuit protection only) as it was protected downstream by 15a fuses IIRC.
The burnt cable was probably more edible than the chicken. :-)
Oh, do they serve chicken now? :-)
Owain
Eeek - what sort of 300 A fuse would protect 2.5 mm^2? - certainly not an ordinary BS 88 gG fuse, regardless of the fault level. A very fast 'semiconductor' fuse might, but it wouldn't take much length of 2.5 mm^2 to attenuate the fault level to the point where the cable would protect the fuse...
Or did you mean a 30 A fuse (which would be OK)?
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