Discuss What crimp for 10mm fly lead to earthing nut ? in the Electrical Tools and Products area at ElectriciansForums.net
Yes, but usually steel so closer to 1.2mm^2 copper in terms of conductivity. Less if stainless...4mm diameter is 12.5sq mm
Take a bit off for the thread groove and it is pretty close to 10sq mm
Over a distance of 1to 2 mm, I can’t believe the material resistance makes that much difference.Yes, but usually steel so closer to 1.2mm^2 copper in terms of conductivity. Less if stainless...
In this case its just for earthing the armour which is not used as the cpc. But the earthing of the armour is required to be able to handle the full fault current and although I'm sure 6mm would be fine a lot of the time if table 54.7 is used (rather than doing the adiabatic calculation) then the fly lead should be the same size as the line conductor so 10mm is the requirement here. I can't think that this is so unusual so I'm surprised that 10mm lugs with small (M4) holes are not widely available.
Keep the earthing nuts for small stuff up to 4mm cable.
Well an M4 screw itself can't carry much current compared to 10mm cable, nor can it apply a lot of clamping force to make sure something that stiff stays in place, etc.
Why? I use earthing nuts for all sizes of SWA gland and haven't had an issue.
They are a lot better in the 32mm and upwards sizes as they have an M8 stud instead of the little screws.
Reply to What crimp for 10mm fly lead to earthing nut ? in the Electrical Tools and Products area at ElectriciansForums.net
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