Ok you can use the armour as a cpc if when the calcs. are done it is not acceptable then you can use an additional earth cable to supplement the armour .If we had a 50mm 4core and the calcs.say it has to have an additional cpc and that a 6.0mm would be ok ,then what happens in an earth fault situation?does say 95% of fault go down the armour and the other 5% go down the 6.0mm .Any comments welcome (i don't no the answer)
yours benji
yours benji