On Thu, 3 Sep 2009 11:38:06 -0700 (PDT), Recyclist wrote:

Today, the RCD won't trip. However when my neighbour switches on her
shower, the connection at the overhead wire crackles and there are
some sparks. It also crackles a bit in the wind.

Oh boy, nothing like with holding information... The supply wiring
should not do that. There is a supply fault. Report it to your REC to
come and fix it and check that the supllies to you and your neighbour
are in order.

Once they have see if this whole house RCD tripping persists.

--
Cheers
Dave.