Look up the maximum permitted Zs values (earth loop impedance) as per BS 7671 2018 18th edition, also includes temperature adjusted values.
Select from the list of protective devices (fuse's, MCB's, RCBO's) and device ratings to calculate the maximum permitted Zs value for your selected protective device.
+ BS 7671 18th Edition 2018
+ BS EN 60947-2 manufacture devices charts (some)
+ BS EN device's
+ Ze + R1+R2 = Zs calculator
+ 100% values
+ 80% values
+ 0.4 second disconnection times
+ 0.2 second disconnection times
+ 5 second disconnection times
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