Hamish wrote:

All the wiring in my new house is run in conduit which acts as the earth.

The conduit terminates in metal boxes approx 5"x"2.5" with the 15 amp
faceplate fixed by four screws in the corners.

Is it possible to buy adaptor plates for these old style boxes or do I have
to replace them and ,if so, how should the earth connection be secured.


Umm. IIRC steel boxes have the right sized holes to take those old
conduits, if the thread is still present on the end, and useable..

There is a lot to be said for em. Fire in yer cables (not unusual with
the rubber insulated cables they use) did not set the local mouse
droppings, and house, on fire.

You CAN simply use em as earth, but heed BigWallops warnings.

IME, you can bodge the odd one if you know what you are doing, but if
its a complete overhaul, you would be better served by ripping out the
whole house wiring and redoing it with modern wiringts to modern
standards and putting in a new consumer unit.

The original cable insulation is likely to be well perished, and the
slightest disturbance may render it unservicable.

Re wire the lot, making as much mess as is needed, and get the plasterer
in afterwards, and redecorate.

THEN you can install all the things like TV and cat 5 cables, LV spots
and so on that will make it a far more useable and saleable house.

A house needs a major workover every 50 years. Time this one had it.







Also, is it permissible to run earth connections from the terminals in new
boxes to existing conduit runs fixed by an earthing strap?

TIA