On 23 May 2005 05:40:14 -0700, "puffernutter"
wrote:


So, the plan could be as follows:

Before spending anything it might be worth looking for neutral to
earth faults. To do this you need to isolate both neutrals and
earths for each circuit which means disconnecting them at the CU.
Short circuits between earth and neutral anywhere within the system
will often lead to random seeming RCD trips.

A common cause is nails through cables where they go over joists
under floorboards.

--
Peter Parry.
http://www.wpp.ltd.uk/