I have had a good quality consumer unit fitted within the last 18
months. Before then I used to have an old fashioned one, first fitted
when the house was built in 1989. The new one was fitted by a qualified
electrical engineer who I have known and trusted for years.

With the old one using the iron would now and again blow the entire
circuits.

The iron was replaced roughly at the same time as the consumer unit.

With the new one, which is fitted with MCBs and an RCD, when using the
new iron, the RCD will trip intermittently. Sometimes the iron can be on
for half an hour or so before it goes and sometimes it will trip almost
as soon as it's switched on.

Nothing else in the house causes this to happen

Before I call my electrician back, does anyone know if there is a simple
possible reason for this? It's such a pain having to reset all the
clocks/timers etc. Still I suppose it's better than dying painfully!!!
--
Kevin Sills