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V.High PFC at switchfuse

Horace Horace
Hello guys

I was looking at a job today at an old house divided into flats where a BS 88 dist board supplies my switch fuse with 60A (which is adjacent to it). The switch fuse is a dated MEM with a porcelain 60A BS3036 but looks in fair condition. Im getting 0.01 ohms ze at the switch fuse and due to this the PFC is off the scale.

Am i right in contemplating that as its a single phase supply under 100a, that the switchfuse's 60A rewireable 3036 breaking capacity can be overlooked as the upstream BS88 will take the brunt of any potential fault and let through no more than 3-4KA which the rewireable can then handle. While were on the topic of breaking capacity's, anyone know the BC of a ceramic MEM 60A 3036 ? I do need to record a suitable PFC value at the switch fuse, my multi tester is is reading 19.9KA (which likely calculates as off the scale). The PFC of the CU in the flat is an easier 3.5KA !


Thanks all



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    If you get stuck, do please come back, but have a read first - this sort of thing has been asked on this forum and it's predecessor a no. of times, but it is easier if you can say ' I understand as far as X but not Y '  and are at least familiar with the terms used so there is not too much misunderstanding when folk start talking about let through energy, bullrush diagrams and so forth.
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    If you get stuck, do please come back, but have a read first - this sort of thing has been asked on this forum and it's predecessor a no. of times, but it is easier if you can say ' I understand as far as X but not Y '  and are at least familiar with the terms used so there is not too much misunderstanding when folk start talking about let through energy, bullrush diagrams and so forth.
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