OP
Geoffsd
Jud - you are strictly correct but post #75 was in reply to another post and I, at least, think it quite obvious that he is referring to his discovery/realisation that the 5, 10, 20 only works with 60898s.max Zs= U0/Ia (x0.8) only works for B C D mcbs 60898 rcbos 61009. (table 41.3) makes life easier to work out max zs without looking it up... fuses i look up. ;-)
Also, as you can see he does refer to 'without looking it up' or as I put it 'needing the graphs'.
I just got the impression that you were 'raining on his parade' when he wasn't really wrong if read in conjunction with his previous post.
Edit -substituted I for you
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