Question

[69er]

Hi

This may be a stupid question but...

If you have a 100A main fuse, you have a 100A main incomer. But why in a split load is the RCD always less? Why not make it 100A too? Thanks.

 

[andy]

Hi

This may be a stupid question but...

If you have a 100A main fuse, you have a 100A main incomer. But why in a split load is the RCD always less? Why not make it 100A too? Thanks.

just one fo those things... the lower the rating, the cheaper they seem to be. even if its just a few quid, people will get the cheaper option

 

[69er]

Thanks - typical.

 

[colport27]

I suppose another reason could be that the main incomer is taking the entire load of the board, where as the RCD is only taking half of the board.

 

[andy]

I suppose another reason could be that the main incomer is taking the entire load of the board, where as the RCD is only taking half of the board.

but it normally takes the most power. all the rings/shower would be on the RCD side. only lights/cooker on the non-RCD

 

[colport27]

True Andy, i almost made that comment on my post.....until I realised that even so.....all the current will be coming through the main incomer.
Therefore that even though the greater load will be on the RCD side....more current will be coming through the incomer than the RCD as this has the total of all circuits.