Is it possible to put a 16mm swa on a 40a mcb protected by an rcd | on ElectriciansForums

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Is it possible to put a 16mm swa on a 40a mcb protected by an rcd
If you look at the technical information from the MCB manufacturers website you should be able to obtain the maximum cable size that the device can accommodate, I think a typical 40A mcb will accept a 25mm cable but you need to check this. You will also need to check that the neutral and earth conductors can also safely be accommodated n their respective terminals. The issue normally with larger SWA cables is having sufficient space in the enclosure to gland and terminate the cable.
 
It will just be rcd protected at the incoming point and then mcbs at the other end
Poor design. SWA doesn't need protection by a RCD, since there's very little likelihood of making contact with the live conductor, without shorting it to earth, in which case the OCD will take care of things.
Ideally this should be a fuse rather than a MCB, to provide discrimination between it and the MCBs or RCBOs at the load end.
 

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