ukylou

Maybe they don't like ring mains ?
I thought you didn't use ring mains in the USA ?

cossak said:

need some help , fitted new RCBO to ring main and it tripped after a few hours. Replaced rcbo with new one and this tripped after 1 hr. tested ring main cables clear between Live,Neutral and earth and all clear to earth.Any help will do

Click to expand...

dmxtothemax said:

Maybe they don't like ring mains ?
I thought you didn't use ring mains in the USA ?

Click to expand...

Since the term RCBO (residual-current circuit breaker with overcurrent protection) is not used in North America (but is used in other English speaking countries), in conjunction with the use of the term "ring main", I strongly suspect that cossak resides in the UK - although he has not posted this as his "Location" - in this, his first post!

(The title of this thread as "ukylou" may be another strong indication!)

He also uses the term "Earth" - where North American practice seems to be to use the term "Ground".

"What's in a name?"

However, since there does seem to be either an "overload" fault or a "leakage to Earth" fault, there is a problem.

He has not stated if the fault occurs without anything being "plugged in" to any socket outlet (i.e. with only the "wiring" being "involved".)
Also, how did he "test" for leakage? Was it just with an "ohm-meter" or did he use an "Insulation Tester"?