Crackle wrote:I have wired several boats that I have built new or refitted over the last 30 years and normally always soldered any flexible stranded wires.
Terrykc wrote:Mike, solder is soft and compresses easily.
This deformation continues after the screw in the connector is tightened as, over time, the metal will creep slowly away from the compression point causing the resistance of the joint to increase - it is effectively the same as undoing the screw connection slightly.
Another problem with soldered flexible leads - which should NOT happen in a mains connector! - is that, as the lead flexes, the individual thin wires will break, one by one, at the point where the solder starts because that is the point of maximum flexing.
The correct solution is a crimped brass ferrule on the end of each multi-stranded conductor.
Alistair D wrote:As far as I am aware no mention is made of checking this during the inspection phase of PAT. It should be.
This is a completely different situation. In the first place, all the strands are completely separate and, in the second place, the thickness of the tin coating is infinitesimally small compared with the diameter of the conductor.Niall wrote:I wonder how this affects "marine grade" cables which are copper stranded with the strands individually tinned?
Alistair D wrote:Good point re the safety testing fail.
As far as I am aware no mention is made of checking this during the inspection phase of PAT. It should be.
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