Ok, so a while back I came across a rather interesting article referencing an incident where MC cable had been buried in thermal insulation resulting in a small fire. The magazine claims that if the cable was de-rated to BS7671 standards over heating would not have occurred.
However, I am skeptical if that truly is the root cause. Rather, is it possible that one of the phase conductors shorted to the interlocked metal armor and due to its high loop impedance (the jacket) became a restive heater? From the photos it appears like the CPC was electrically isolated from the armor via paper.
Do such cables exist in the UK? What do others think?
However, I am skeptical if that truly is the root cause. Rather, is it possible that one of the phase conductors shorted to the interlocked metal armor and due to its high loop impedance (the jacket) became a restive heater? From the photos it appears like the CPC was electrically isolated from the armor via paper.
Do such cables exist in the UK? What do others think?