On 28/05/2015 11:25, Dave Plowman (News) wrote:

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?

Compression fittings are brass. Tube copper.

Electrical fixing screws (and the terminal it screws into) are generally
brass. Cable copper.

Have you never done any DIY that you have to ask such a question?


I just wanted to check what material is used, as I have been accused
here of making assumptions. I thought it was generally brass, and
thanks for confirming.

The coefficient of expansion of brass is 18.7, whilst copper is 16.6
(10-6 m/(m K)), so they are fairly similar.