RCBO blue flying lead

[JohnW2]

Doesn't 'multiwire' cover all then?

It might do (I can't find a definition anywhere). I did consider that they simply meant 'stranded', but the regs usually use that word when it's what they mean and, if 'multiwire' covered all stranded cables, they presumably would not have added 'fine wire and very fine wire' - so it's hard to tell!

Whatever, the important message is that tinning and screwed connections are a 'bad news' combination for any conductor.

Kind Regards, John.

 

[Taylortwocities]

Well, I never did see that reg ever. Apologies

 

[JohnW2]

Well, I never did see that reg ever. Apologies

No problem. Any idea what they mean by 'multiwire'?

Kind Regards, John.

 

[kai]

Perhaps older readers will recall, the ancient twin twisted "3/029" lighting flex installed up until the end of the sixties was tinned as far as I can recall - having ripped some 1960's lights out around six years ago, the lighting flexes were all tinned copper strands.

 

[JohnW2]

Perhaps older readers will recall, the ancient twin twisted "3/029" lighting flex installed up until the end of the sixties was tinned as far as I can recall - having ripped some 1960's lights out around six years ago, the lighting flexes were all tinned copper strands.

Indeed, and I think one can still buy some flexible cables with tinned copper strands. Much 'equipment wire', whether solid or stranded, is still tinned.

However, I imagine that a very thin and uniform layer of factory-applied tin coating/plating has minimal detrimental effect on a screwed connection. It when a human being comes along with his/her soldering iron and generous amounts of solder that the problems are more likely to arise.

Kind Regards, John.

 

[bernardgreen]

The layer of tin on tinned copper is very often almost pure tin which is hard where as a coating of solder has either lead ( old solder ) or aluminiun ( new un-improved solder ) both of which are soft and can deform under pressure. Also the coating of solder can be quite thick.

 

[JohnW2]

The layer of tin on tinned copper is very often almost pure tin which is hard where as a coating of solder has either lead ( old solder ) or aluminiun ( new un-improved solder ) both of which are soft and can deform under pressure. Also the coating of solder can be quite thick.

Quite.

Kindest Regards, John.