On Tue, 01 Apr 2008 01:27:22 +0100, Andy Wade
wrote:

Both single- and double-pole switched RCBOs are available. Generally
speaking 2-module width ones are DP and 1-module width ones are SP,
although that rule might not hold universally


What are the disadvantages of a single pole RCBO over a double pole
one? Surely the important thing is that the live is cut in an
emergency. What are the advantages of isolating the neutral too? The
only one I can think of is if the Cu is wired back-to-front and I
would hope anyone wiring a Cu would know enough not to do that!

Thanks.