Main fuse help.

[schoe]

on my installation the consumer unit is protected by a BS 88 fuse 100a, i was just looking in the on site guide and it says the rated short circuit capacity is 50 at 415 v.. when doing my PSC i got 1.6 ka and PEFC of 1.4ka does this mean my main fuse is to low to deal with possible prospective fault current?

Thanks as always Chris

 

[Guest123]

The 50 is 50KA, look at the column header.

Are you 100% sure it is BS 88??

 

[telectrix]

sure a BS88 fuse has a KA rating of 16.5kA.

 

[schoe]

without pull the fuse, all it says on the outside is bs88 1967 100 amp

 

[Roger]

sure a BS88 fuse has a KA rating of 16.5kA.

Yep thats right also
BS1361 type 1 16.5kA
BS1361 type 2 33kA

It all on a really useful chart i got off here a while ago.

 

[Guest123]

Yep thats right also
BS1361 type 1 16.5kA
BS1361 type 2 33kA

It all on a really useful chart i got off here a while ago.

We're talking BS 88 here.

In old money a BS 88-2 is 50KA @ 415V, a BS 88-6 is 16.5KA @240V & 80KA @ 415V

 

[ringer]

So which version of BS88 are the ones marked1967 then?

 

[Guest123]

If it's from 1967 it'll be -2.

-6 arrived in 1988.

 

[schoe]

so on that note the bs88 fuse is more than acceptable!

 

[schoe]

Thanks Lenny!