R1 plus R2 ??

[pushrod]

Ze is a novel way to confirm polarity but if you think about it, it does do it lol. Zs by measurement will confirm polarity and as our NICEIC people don't like us doing this by measurement, then their way wouldn't confirm it, but your quite right it is confirmed on testing.

We were taught to have confirmed polarity of supply with approved voltage tester not other instruments and to have confirmed installation polarity before doing a Zs. College world vs real world ??

 

[malcolmsanford]

No real world is on an intial verification if you installed you would be fairly confident you had not made a mistake. R1 + R2 would be your dead polarity test. If a ring main then the r1 rn and r2 would do this and confirm polarity even more.

PIR then Zs by measurement would confirm polarity for me. I don't think I do R1 + R2 on a PIR. I would do R2 with a wander lead and put R2 in rather than R1+R2. It depends on circuit access. Most likely domestic I would do a full R1+R2.

No I just thought Ze was a novel way to prove polarity becasue it does. Try get a Ze N/E or N/L

 

[pushrod]

No I just thought Ze was a novel way to prove polarity becasue it does. Try get a Ze N/E or N/L

Pretty sure my meter would give a reading on N/L.

 

[malcolmsanford]

I'm sure it will as Fluke I know will give you a reading on Loop impedance on L/N in ohms so I suppose yes you would get a reading L/N at Ze

 

[nickblake]

I was how i was taught and im sure you guys have come across a supply with incorrect polarity ,so it was always test your Ze then if you get reversed polarity doing a Zs test then you can be sure that the wiring is at fault ,this is part of the reason i do a Zs test at each point on a circuit whilst doing a PIR as you never know , its the same with PAT testing i always test the socket im plugging in the pat tester in as there would be no point testing appliance is the supply is dodgy

 

[IQ Electrical]

I'm sure it will as Fluke I know will give you a reading on Loop impedance on L/N in ohms so I suppose yes you would get a reading L/N at Ze

Yes, that's true, it's also a good way of helping to confirm the supply type if any doubt exists-on a TN-C-S your L-E loop test will be identical to your L-N loop test at the origin whereas on a TN-S the L-E loop reading is normally higher than the L-N.

 

[malcolmsanford]

I always confirm the TNC-S on the PSCC/ PEFC test as well