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Trev, it's very much true that live Zs testing is discouraged, in principle. I have recently been back to college to finally get round to my 2394/5 and have encountered this in practical exams.
The reasoning given is that:
That said, PFC is still expected to be measured directly, go figure !
The reasoning given is that:
- The EAWR forbids live working unless it is absolutely necessary
- BS7671 allows Zs to be determined by other methods than live testing
- The values used to calculate Zs are both measured values so a meaningful result is obtained
That said, PFC is still expected to be measured directly, go figure !