3 phase distribution

[Darkwood]

They are for bs88 fuses hence my original query these standards don't apply to mcb's and rcd's which is what we use commonly... ill try find the discriminating charts for mcbs.

 

[Leesparkykent]

They are for bs88 fuses hence my original query these standards don't apply to mcb's and rcd's which is what we use commonly... ill try find the discriminating charts for mcbs.

Yeah but the fuses in the head will more than likely be 1361's now BS88 and the fuse in the switch fuse will be BS88 which will provide discrimination if 100A up stream and 63A down stream. A 32A b type 60898/61009 will partially discriminate with the 63A BS88 but full discrimination can be achieved if Zs/Zdb isn't any lower than .10 ohms.