TN-C earthing is not permitted within a consumer's installation. It is
permitted on the main supply line to the property, provided the earth is
separated off into TN-C-S within the supplier's cut out.

With concentric the earth and neutral are seperate conductors, the neutral
strands of the armouring are all seperatly earthed.

The TN-C system is called PEN when used inside an installation (protective
earth and neutral, TN-C refers to the distribution system). It is alive and
well in many of the blocks of flats in the area I work in. I belive PEN is
the main system used on the continent and that it is still ok to use in new
installations, though PME is by far the most popular sytem in the UK.

Regards, Blew


"Christian McArdle" wrote in message
. net...
It's unusual to see SWA with an earth wire, are you sure it's not
concentric. Consentric carries the earth and the neutral in the
armouring,
with the strands that carry the neutral coated in a PVC sheath. Typicaly
concentric will have no brass glands on each end of the cable.


Christian.