In the context of the thread Mike, I was thinking more along the lines of rigid copper pipework presenting the same physical hazard as a cable would to firemen attempting access where the melting clips would allow the pipework to fall and present a dangerous obstacle/trip hazard for example.

There is also the problem that fallen half-melted lengths of plastic pipes present in the same way as plastic trunking?

In the context of the thread Mike, I was thinking more along the lines of rigid copper pipework presenting the same physical hazard as a cable would to firemen attempting access where the melting clips would allow the pipework to fall and present a dangerous obstacle/trip hazard for example.

There is also the problem that fallen half-melted lengths of plastic pipes present in the same way as plastic trunking?