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The soot was in between the rcbo and the busbar on board("in" side), not on the "out" side

swap it back then

Try swapping the red in com(not the link one tho) on switch 1 with red in L2 on switch 1

I replaced a MCB with a RCBO today for socket circuit in small factory unit. I tested it all and it was fine. After i left there was a bang in the CU and the power went down, blowing two of the three main fuses (3Phase). Upon investigation there seems to be soot on the new RCBO which is red...

yeah know how to wire two way and intermediate, will i have to find junction box if wanna add 3rd swicth tho?

Just been to house to add 3rd switch to landing light circuit. Thought would be easy simply adding 3core and intermediate switch. But when opened both swicthes up, upstairs and down, both only had 1 wire in each of the 3 terminals, instead of 2 wires in L1 & L2. How can i add the 3rd switch...

Will this fit in the old merlin germin c45n place? http://cgi.ebay.co.uk/Merlin-Gerin-RCBO-BNIB-C60HC32R30-30A_W0QQitemZ250151074527QQihZ015QQcategoryZ26215QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Any advice welcome

Come across a S/O which has cables from ring into connector block then 2.5mm TW&E from CB to S/O as cables from ring are too short. What number would this be on a PIR and is it dangerous or against regs? Is it just treat as a radial?

Yeah its above and to the right. What is the minimum distance the regs state to be from the sink? Or is it just common sense previals?

Sorry John explained badly, cable runs in correct way (left/right/up/down) i mean the box is 100mm to the right of the sink, but maybe 300mm high, so it works out 400mm away from sink, is that ok? Its on RCD for added protection

Come across a blanking plate today about 100mm sideways from a sink in a cloakroom but a good 400mm from it diagnally. behind it was a connector block feeding a boiler from the ring. Obviously this needs fusing down using a FSU but is it allowed inside a cloakroom? If so how far away from sink...

Its defo PME and already has 10mm into side of head, so its just a case of connecting a bigger cable

What about expanding foam?

Is that yes you can connect straight from Neutral/Earth connection to CU?

Who connects the earth into the head then? Would it still be ok to change CU if 10mm main earth from head to CU?

So what height will BC suggest?

Is it ok to upgrade main bonding from PME to CU with 16mm Cable simply by isolating supply then making connections at CU then to the PME earth terminal?

Will building control make me put it at that height? It will seem funny at a that height in a kitchen, near incoming supply?

Is there a height at which a new CU in a rewire HAS to be?