Type B is times 5 so B32 = 160 amp. So 230/160 = 1.4375 ohms book value 1.44 ohms
So B16 = 80 amp and 230/80 = 2.875 ohms book 2.87
B40 = 200 amp and 230/200 = 1.15 ohms book 1.15
B6 = 30 amp and 230/30 = 7.666 ohms book 7.67
All simple maths really!
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