On 9 Nov 2006 01:30:03 -0800 someone who may be
wrote this:-

I work from home most days and have approximately 6 workstations in my
home office, occasionally they are all on concurrently along with a
number of associated small power supplies feeding printers etc - most
of the time all is well however this morning turning on a single
workstation tripped the ring breaker. Reset ring breaker then tried the
workstation again and it tripped the main breaker, reset main breaker
and tried another workstation and all was well - then turned on the
first workstation again and again all was well.

Do remember that these "breakers" are operating for different
reasons. The main one is operating because it detects a lack of
balance between the current flowing in the live and neutral
conductors that is above the set value. The ring one is operating
because it detects a current flowing on the live conductor for a
time that is above the time/current characteristics.

The ring breaker has been changed for another 30A and it still tripped
either itself or the main - the ring breaker has also been upped to a
40A

Did you, or anyone else, calculate whether the wiring is suitable
for this first?

Intermittent faults are always the worst to diagnose. It needs
proper recording equipment to find out what is going on. Guessing
what is happening may work, but it may not.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54