16A c 60898-1 tp mcb max zs @ 80%

[vitoboy]

hi all
does anyone know where I can find chart for 60898-1 (ie 3 phase) mcbs showing the 80% of max like we have for single phase mcb's.
im slightly confused by bs 7671 no showing anything other than uo 230v....or am I treating each phase of a mcb as 230v.

all advice gratefully accepted

ta vitoboy

 

[Darkwood]

What is your Earth loop impedance measuring between ?....(clue in the question)
Once you have answered this you should understand why no 3ph mcb charts exist.

Your confusion here is you need to learn your test procedure for a 3ph supply or final circuit and you will realise your error.