Paul Burridge wrote:
On Sat, 9 Aug 2003 09:01:05 +0100, "Ian White, G3SEK"
wrote:


A typical household RCB will trip on a 60 or 100mA difference in supply
current surges up to 60A. That's pretty good common-mode rejection!

It's better than that. 30mA is the standard currently.

Sorry, I got mixed-up about that. Our house was wired under the older
regulations which allowed the lights to be protected by a separate 100mA
RCD, while the power outlets are protected at 30mA. The idea was that
tripping a power circuit is less likely to plunge the whole house into
darkness.

The standard for new household installations is now 30mA all around,
although 100mA units are still available for industrial uses.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek