"Andy Burns" wrote in message
o.uk...
wrote:

Andy Burns wrote:

Why does an RCBO require a functional earth, when an RCD doesn't?

The earth connection enables the RCBO to trip even with a lost neutral
connection.

I'm curious why have we ended-up with RCBOs that generally do have an FE
connection and RCDs that generally don't?

Cost?

http://www.eaton.com/Eaton/OurCompan...ses/PCT_255273

But then Eatons RCBO do have an earth lead.
--
Adam