Dave Plowman (News) wrote:
In article ,
Bob Minchin wrote:
Would a socket with a lower fault current limit sort this - and who
makes one? Not much point in having this one if the main one is going
to trip first. Although it does pre-date the split load CU.

Dave,

Don't automatically blame your local bench RCD. It is possible that
there is enough leakage in the rest of your installation to be near the
threshold of your split CU RCD and a few mA extra from your ATX PSU
tripped that whilst being well below the threshold of your local one.

Yes - although I don't get nuisance tripping from the main one. Oh - it
wasn't a few extra mA from the ATX - try an earth to neutral short via the
case due to a trapped cable. ;-(.

In which case it is a "race hazard" - either or both could trip. This is
why TT installs with cascaded RCDs use a time delay type at the head end
to ensure discrimination.



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/