Hi i've got my 2391 practical exam coming up and was wondering when i get my Ze value at the consumer unit can i then use that value for my Earth Fault Loop Impedance for all the circuits on that system.. say like a socket ring or radial? and the motor? or do i have to work them out individually and test at each socket? for my e Ze value.. Then put them into the Zs = Ze (R1+R2) to determine my Zz.....
Thanks
Thanks