misprint?

[dingodeano]

Its been a long day..
Just looking up some figures and came across this sheet on the esc website.
but do the BS1361/2 fuse ELI max figures for 13a and 15a seem odd ?.

http://www.esc.org.uk/fileadmin/user_upload/documents/industry/faqs/master_EARTHFAULTLOOPtable.pdf

 

[JohnW2]

Its been a long day..
Just looking up some figures and came across this sheet on the esc website. ... but do the BS1361/2 fuse ELI max figures for 13a and 15a seem odd ?. http://www.esc.org.uk/fileadmin/use...y/faqs/master_EARTHFAULTLOOPtable.pdf[/QUOTE]
Indeed so - the figures for 15A should obviously not be higher than those for 13A. I'd have to cogitate a bit more to work out which (if either) is correct (or maybe the two are transposed).

Kind Regards, John

 

[securespark]

3.06 is right for the 13A, with the 0.8 factor.

I've worked it out at 2.94 for the 15A, but not sure if that's right.

 

[PrenticeBoyofDerry]

nothing to do with 13A=BS1362 and 15A=BS1361 then?

 

[EFLImpudence]

The figures are correct (compared to BGB)

 

[JohnW2]

nothing to do with 13A=BS1362 and 15A=BS1361 then?

Ah, you could well be right - but what a terrible way of presenting a table!! Does the Standard actually preclude the possibility of a 13A BS 1361 fuse?

Kind Regards, John

 

[JohnW2]

The figures are correct (compared to BGB)

I agree that the figures for a 13A BS 1362 are correct in terms of the BGB. Where in the BGB did you find a figure for the 15A BS 1361 one?

Kind Regards, John

 

[EFLImpudence]

I should have written BS 7671. They are in the BRB.

 

[JohnW2]

I should have written BS 7671. They are in the BRB.

Where? (I need to dig out my BRB!) Are you saying that they removed them in Amendment 1 (BGB)?

Kind Regards, John

 

[EFLImpudence]

Page 48, Table 41.2 BRB.


Now BS 88-3 fuse system C. (1361 withdrawn)

Page 55, Table 41.2 BGB.
and reconfigured at 5,16,20 & 32A.

The 5A has the same max.Zs. but the 20A lower than before

 

[JohnW2]

Page 48, Table 41.2 BRB. Now BS 88-3 fuse system C. (1361 withdrawn)
Page 55, Table 41.2 BGB. and reconfigured at 5,16,20 & 32A. The 5A has the same max.Zs. but the 20A lower than before

Thanks; I guess that explains why I couldn't find figures for BS 1361!! However, the Table linked from the OP has a column for 'BS 88-3 System C' as well as for BS 1361/1362', but the figures in those columns don't correspond - so do I take it that, whilst the former has 'replaced' BS 1361, they are not direct equivalents?

Kind Regards, John

 

[EFLImpudence]

However, the Table linked from the OP has a column for 'BS 88-3 System C' as well as for BS 1361/1362',

I hadn't noticed/looked at that. No 88-3 in BRB.

but the figures in those columns don't correspond -

Except the 5A @ 0.4s ???

so do I take it that, whilst the former has 'replaced' BS 1361, they are not direct equivalents?

I would assume (never assume) so, hence my comment about the 20A.

As the 'new' ones have a slightly higher max.Zs I suppose they must be faster acting with a lower fusing factor and so 'better'.

 

[JohnW2]

However, the Table linked from the OP has a column for 'BS 88-3 System C' as well as for BS 1361/1362',

I hadn't noticed/looked at that. No 88-3 in BRB.

but the figures in those columns don't correspond -

Except the 5A @ 0.4s ???

Indeed, that is correct. 5A @ 0.4s is the same for both 'BS 1361/2' and 'BS 88-3 System C'.

As the 'new' ones have a slightly higher max.Zs I suppose they must be faster acting with a lower fusing factor and so 'better'.

Indeed, that would appear to be the implication. They're actually not a lot 'worse' than a Type B MCB.

Kind Regards, John