Discuss adiabatic on earth bonding in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
Shut up you lol ....................All this talk of Sunday Roasts, I have a chicken Swarma for my tea
As Tel said by using the 115 value your not going wrong as your erring on the side of caution, all your going to do is get a higher CSA value which in anything under 16mm is not going to be that expensive. Once your starting to go over that and it's running 60-70 metres then it can become an expensive mistake
In your scenario I would not consider a single earth conductor taped to a single SWA as "bunched". if there were 6/7 SWA and 6/7 Earth conductors all taped together and run together, then to me that would be "bunched", and I would use start to use table 54.3 and the lower value for safety.
In a way, you do use the fuse trip current.
If you had a PEFC of 500A, with a BS1361 fuse, you would either have to use the values in the table (460A and 5s), or determine from the graph at what the actual disconnection time would be (about 1.5s).
Where people often go wrong, is they use the time value from the table, along with the measured value of PEFC. This results in a larger CSA than is necessary.
Spin - I was thinking about this myself but cannot find a graph in Appx 3 for a BS 1361 fuse. Am I going nuts?
PP
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