Due to my problems with LV lighting I've got a Type-C MCB which I need to
fit into my consumer unit.
So I turned off the main switch, unscrewed the cover and pulled it off
dislodging a number of dead spiders (not pleasant). I the unscrewed the
original MCB but amount of pulling or pushing in any direction would release
the thing. So I screwed it back in and replaced the cover.
Would somebody mind giving a me a quick overview on how to replace an MOB?
Please make as noddy as possible.
Also looking at the front panel of the unit - does the RCD protect all of
the circuits or just some of them? The unit is a Hager by the way.
They usually clip onto a length of 'DIN' rail screwed to the back of the
unit, and to get them off you release a clip (usually at the bottom of the
mcb) with a small screwdriver. If you look at your replacement part the clip
mechanism should be obvious. Having said all that I've never used a Hager
unit so they may be totally different !!!!!
btw what's wrong with dead spiders? It's the live ones with big teeth that
you have to worry about <G>
Assuming it is a standard DIN rail, there are two methods (after DP
isolating the entire house supply and unscrewing the terminals to the MCB).
1. Remove the entire live busbar and remove the MCB.
2. Find the little sliding clip on the back of the MCB and slide it right
out using a small flatblade screwdriver. The MCB should now be leverable out
at an angle without having to remove the entire busbar. You may be able to
find MCBs without this feature, although I doubt they are common, except in
very early DIN rail designs.
I can't tell without looking at it. There are a number of different
configurations. However, as a general rule (with attendant exceptions), if
there is a separate main switch with a separate RCD, then only some of the
circuits are RCD protected. This is a good thing.
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