On 28/05/2015 10:17, Dave Plowman (News) wrote:
In article ,
Mike Tomlinson wrote:
As there is with any metal. But you don't expect the copper pipes in
your central heating to fail, so why expect wiring to do so?

Your pipes aren't held together with screws, which loosen over time.

You've never come across a compression fitting, then?

I could see that one coming. What are the screw joints made out of in
electrical work? Brass? How does the coefficient of expansion compare
with copper?