dennis@home wrote:

What Peter said, and lower earth fault loop impedance (hence quicker
disconnect times),


Hmm,
An RCD would disconnect an earth fault in 30ms even with a high impedence
earth.

If it is a circuit protected by RCD that is.

Not all socket circuits need to be RCD protected. Some you would not
want to be either (like ones with high leakage, such as IT systems for
example)

High impedence to earth is probably safer for the individual who completes
the circuit.

Without an RCD, 1 ohm as opposed to say 0.5 will keep him connected for
a fair bit longer.

I would use 2.5mm2 for a radial myself and just use more of them.

Each to his own, but many find 20A circuits less flexible though.

--
Cheers,

John.

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