I'm due to attend a testing and inspection course but would like a bit of prior knowledge.
Loop impedance Ze, where exactly is it to be measured? Is it at the earth terminal of a DB? Do I have to disconnect any earth connections to pipework, steel framework etc? So the reading is purely the cable.
Zs, similar question.
R1+R2. I believe it is the resistance reading of the phase and earth conductor in series. What is done with 3 phase work. Are 3 seperate readings required?
PFC. Where is that measured? At the furthest point or at the DB earth terminal?
Loop impedance Ze, where exactly is it to be measured? Is it at the earth terminal of a DB? Do I have to disconnect any earth connections to pipework, steel framework etc? So the reading is purely the cable.
Zs, similar question.
R1+R2. I believe it is the resistance reading of the phase and earth conductor in series. What is done with 3 phase work. Are 3 seperate readings required?
PFC. Where is that measured? At the furthest point or at the DB earth terminal?