# How to test R1 and R2 at the same time?

## How to test R1 and R2 at the same time?

People just get confused at times with the letters and symbols for things (or cant be bothered to use caps lock). Little r2 is end to end continuity on the CPC. It’s R1+R2. R1+R2 is testing both at same time. Always finish first….story of my life. R1+R2 is testing both at same time. Click to expand… Lenny your misses tell you that mate????

### When to use r1 + r2 to test polarity?

if you are going to use the results to test for polarity …. then you will need the R1+R2 measurement. Consider what an R1+R2 test will show if L and PE had been swapped over somewhere. R1+R2 only verifies polarity (e.g. L is in the right place) if PE can be known to be good (it doesn’t spot L and PE reversal).

#### Do you need R1 or R2 for Zs?

If you are only testing for “continuity of protective conductors” then either method will surfice. However if you are going to use the results to test for polarity or use it determine Zs (by adding R1+R2 to Ze) then you will need the R1+R2 measurement.

How to test a radial circuit with r1 + r2?

Hi. If you are R1+R2 testing on a radial circuit then you simply isolate all power at the DB i.e main switch off, place a link between Line and Earth of the circuit you want to test, then go to the end of that circuit and measure the continuity between Line and Earth.

When do you need to use R2 tests?

R2 testing can be used quite a lot when carrying out PIR’s, especially on commercial or industrial premesis where parallel earth paths are in existance meaning an R1+R2 test is useless unless you can remove all parallel paths. Click to expand… How does that remove parallel paths? It can’t. A run of SWA from a DB to a socket.

## Which is better R1 or R2 polarity test?

Click to expand… Either R1+R2 (test method 1) or R2 (test method 2), one or the other. When using test method 1, polarity is confirmed as a matter of course whereas if you opt for R2 testing then you need to carry out a separate polarity test.

### How to get the true R1 + R2 test?

To get the true R1+R2, you would disconnect the earth at the socket and test between the live and the earth in the cable only. If there where more than one socket in the circuit, you would need to disconnect them all, but in practice you would not. Doing an R2 would make to difference. Maybe not but an R1+R2 test would be just as meaningless.

#### Which is easier to do R1 or R2?

Doing an R1+R2 also confirms polarity which allows you to miss a step in the testing. As part of a PIR the R2 test is usually easier as it involves less dismantling. But with an R1+R2 test all your doing is putting a conecting conductor between the live and earth at the cu? What other dismantling takes place?