"Doctor Drivel" wrote in message
...

"John Rumm" wrote in message
news
Doctor Drivel wrote:

"John Rumm" wrote in message
...
Doctor Drivel wrote:

"John Rumm" wrote in message
o.uk...
Doctor Drivel wrote:

"js.b1" wrote in message
...
On Nov 11, 2:56 pm, "Doctor Drivel"
wrote:
I would tend to go for double-pole RCBOs on all circuits.

Good way of ending with a mile-long CU & higher cost.


And greater protection and the lot not tripping out only that
circuit.

Single pole RCBO devices would offer the same level of fault
protection

That is total drivel.

I can only assume

Some device that isolates the L & N when it activates must offer a
higher level of safety.

No, this is an area where you can't generalise without knowing the
specifics. Firstly you are confusing fault protection with some nebulous
concept of "safety".

I am not. If the device activates and cuts out all electricity conductors
(L&N) it must by definition be safer. In fact if the earth is isolated
even better, then all electrical conductors are isolated from the
appliance or circuit.

No.

Only the live and neutral are the electrical (phase) conductors. The earth
is a circuit protective conductor. The earth connection does it's job
properly by not having it's circuit broken.

You would not want for example a lump of metal such as a combi boiler and
it's copper pipework to have all it's live, neutral and earth connections
isolated when you turn the power off to it.

That would mean that a fault elsewhere, such as a live cable from another
circuit touching a copper pipe would make the combi and it's pipework rise
up to 230V.

Adam