I have been moving some sockets and have a question about cable.
The existing cable used to wire the ring circuit looks a lot like moderm cable, i.e., grey sheath, twin core and earth. It is 2.5 mm cable, however it the cores are not single stranded, they are multi-stranded (a bit like a modern 4 or 10mm cable). Also the cable is a bit more flexible that the new cable I am using.
Is the above likely to be rubber, or was earlier PVC coated cable more flexible?
It does not appear to be crumbling, which I was told was a sign of very old rubber wiring.
old power cable as you describe is prob. 7/.029 inch2 which if grey is pvc not rubber which was always black,
white & grey were used depending on where it was being seen, unlike now where grey is normal cable & white is low smoke/fume (costs more).
old pvc much more flexible & usually easier to strip (progress?).
When introduced in early 1960's we were told life 'infinite' if not overloaded, unlike rubber which had a normal life of around 30 years, unless touched by plaster when it was reduced seriously by lime in plaster.
you have 7 strands of 0.029sq inch cross section area = 2.5mm2 today
other sizes being: 1/044 = 1.0mm, 3/029 = 1.5mm, 7/036 = 4.0mm,
7/044 =6.0mm, 7/064 = 10mm, 19/044 = 16mm, bet you wished you hadn't asked!! regards SPARX
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