"williamwright" wrote in message
...

All plastics have melting points above the boiling point of water. Central heating
systems do not run at boiling point. A round cross-section cable touching a round
cross-section pipe wouldn't have a large area of contact but the cable would have a
large surface area with which to dissipate heat.

Like I said before (and it seems nobody was taking a blind bit of notice) in a lifetime
of fixing aerials and dishes I never once saw this problem.

Bill

Out of curiosity I found the following

Clip On Hot Water Pipe Thermometer 0-120C 63MM Temperature Gauge

https://www.amazon.co.uk/Thermometer.../dp/B01N8SQS54

Which goes up to 120C Which suggests the pipes themselves can exceed
the temperature of boiling water which is 100C. Most other pipe
thermometers seem to go to 120C as well. Not that I'd claim to
understand how this makes any sense.

Then there's this

quote

Polyethylene and polyvinyl chloride are used as insulators. These two
plastics have relatively low melting points, and can start to soften at
temperatures as low as 150 degrees F. [65 C]
If the insulation is exposed to low heat over long periods of time, the
position of the center conductor in relation to the shielding may shift
as the hot plastics yield. If the center conductor and shielding
touch, signal never makes it past that point. Coax should be kept away
from heatsinks, stage lights, and other sources of heat

quote
https://www.rfvenue.com/blog/2015/02...cable-goes-bad


It appears its not the actual contact but the heat being radiated (?) by
pipes potentially being up to 120C over prolonged periods which may cause
the problem

Or not, in your experience apparently.


michael adams

....