On Jun 18, 11:46*pm, Tim Watts wrote:
That's 55-0-55 aka 110V you're thinking of and the 55V (relative to earth)
counts as ELV.

Fair point, but isolation transformers with a 230v secondary are sold
as 'safety site transformers', which is what I was meaning. For
example these from RS:

http://uk.rs-online.com/web/p/safety...rmers/0405565/
http://uk.rs-online.com/web/p/safety...rmers/2604238/

Our house is of a vintage (built six years ago) when no RCD protection
was required on the lighting circuits, so in that context I can't get
myself too worked up about garden lighting with no RCD protection,
especially if it's only running at 115 volts wrt ground.

Richard.
http://www.rtrussell.co.uk/