On 09/09/2019 09:49, firstname.lastname@example.org wrote:
Well this is just for testing, not normal operation. If you wanted the
ELI at multiple socket positions, then swapping it for a MCB for the
duration of the test would be the simplest.
If you are seeking to measure the installation loop impedance and hence
prospective fault current, then you could add a temporary "circuit" for
The hardest situation to deal with is where there is no normal main
switch, and only RCDs. If you need to do that with any regularity,
getting a "non tripping" tester would be the way forward.
Yup, the old high current testers like the Megger LT5/6 are quite good
for that, since they also put the electrode under some stress for
testing. The figure you get will not be the true Ze, in that it will
also include the supply impedance as well, however for most TT installs
that will be negligible compared to the earth impedance. (e.g. typically
less than 0.5 ohms for the supply, and 10 or more ohms for the earth)
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