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Zs taken by live test and r1 r2 calculated by deducting Ze or Zdb

Ro

Is the only reason you do not calculate r1 r2 by deducting Ze/Zdb from Zs is that it is down to parallel paths. The reason I am asking is, when the apprentices are doing their trade test, they are encouraged to short the circuit they are working on to the earth bar via a crocodile clip to get r1 r2. Surely this is picking up parallel paths also? Or is there is another reason?

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    Ro said:
    when the apprentices are doing their trade test, they are encouraged to short the circuit they are working on to the earth bar via a crocodile clip to get r1 r2

    Initial verification or periodic I&T?

    If initial, I was taught to cross the line and CPC over each other and hold them together with a croc clip. It works well. Or you can use a lever Wago or similar. The test should be done before either cable is terminated in the DB.

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    Ro said:
    when the apprentices are doing their trade test, they are encouraged to short the circuit they are working on to the earth bar via a crocodile clip to get r1 r2

    Initial verification or periodic I&T?

    If initial, I was taught to cross the line and CPC over each other and hold them together with a croc clip. It works well. Or you can use a lever Wago or similar. The test should be done before either cable is terminated in the DB.

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