That may be right Pauluk, as most of the twin lighting wire I'm finding now is from houses built in the 60's.
Has anyones regs ever stated that a metal light fitting doesn't have to be earthed if it is placed higher than a certain measurement above ground level ? I've heard that theory alot here and I've never been able to find anything in AS/NZS 3000. ( I can't be bothered looking in the old regs ).
