Fault on lighting cct prevents taking Zs

[Michael J]

The use of C1 means it must have been an immediate danger, perhaps where machines and isolators are mislabelled which could end in disaster. At home having lights up being lights down is not so much of a concern (must fix that ).

I Agree with you Wilko, circumstances dictate. No hard and fast rules.

 

[Octopus]

I'm assuming that the last inspector didn't actually do any circuit tests!

C1 for no labels ....Pathetic

 

[DefyG]

I can understand the light switch being furthest point from the CU if the light point was also the furthest light point from the cu but there would only normally be a live and switched live return at the switch, No neutral in order to take a Zs reading!
And if so, the furthest point and highest reading would be between the switched return and the neutral AT the light fitting, not the switch.

 

[Strima]

I can understand the light switch being furthest point from the CU if the light point was also the furthest light point from the cu but there would only normally be a live and switched live return at the switch, No neutral in order to take a Zs reading!
And if so, the furthest point and highest reading would be between the switched return and the neutral AT the light fitting, not the switch.

Zs on a neutral?

 

[DefyG]

No not on a Neutral but my meter (3wire device) needs a neutral connection to make the reading.

 

[ukiri]

Then join E & N together , Metrel testers have a double end on one of the probes to do this. Apart from this the OSG shows how to take Zs from a light sw.

 

[DefyG]

Yeah have done that before and you would expect readings to be the same but they weren't.
Does seem more accurate with the N connected, but maybe that's just the meter I was using at the time, when compared with a mates MTF 1552 which had been recently calibrated.

 

[Harry_P]

Yeah have done that before and you would expect readings to be the same but they weren't.
Does seem more accurate with the N connected, but maybe that's just the meter I was using at the time, when compared with a mates MTF 1552 which had been recently calibrated.

In these days of multifunction testers the idea of getting 2 identical test results from 2 seperate tests are long gone. That's the big disadvantage with MFT's