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- 24 Aug 2009
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Hi,
I have a Crabtree split board CU which has 'B' type MCBs in it. My Shower, upstairs and downstairs ring mains are RCCB protected but the rest is not. I was advised that I could replace the two 6amp lighting MCBs with RCBOs for extra protection and I would like to do it. I do understand how RCBs etc. work by comparing the current on the live and the neutral and looking for an imbalance. So I realize that the unmonitored neutral will also need to be connected to an RCBO as will the returning neutral from the lights. I am also aware of the borrowed neutral on the landing light problem, I will run another neutral for it.
Now my questions...
There appears to be a blue and a white wire. Which is which and where do they connect? The white wire looks too thin to carry the neutral. Can't find a spec for these devices on the net just people selling them.
Also, what doe this 'B' mean as opposed to A and C? Something to do with size?
Cheers guys.
Bob.
I have a Crabtree split board CU which has 'B' type MCBs in it. My Shower, upstairs and downstairs ring mains are RCCB protected but the rest is not. I was advised that I could replace the two 6amp lighting MCBs with RCBOs for extra protection and I would like to do it. I do understand how RCBs etc. work by comparing the current on the live and the neutral and looking for an imbalance. So I realize that the unmonitored neutral will also need to be connected to an RCBO as will the returning neutral from the lights. I am also aware of the borrowed neutral on the landing light problem, I will run another neutral for it.
Now my questions...
There appears to be a blue and a white wire. Which is which and where do they connect? The white wire looks too thin to carry the neutral. Can't find a spec for these devices on the net just people selling them.
Also, what doe this 'B' mean as opposed to A and C? Something to do with size?
Cheers guys.
Bob.