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r1+r2

  1. J

    Rather Low R1+R2 Query

    Quick query I’m hoping someone can clear up. Im just looking at an example of a schedule of test results in a book I’m studying and I’ve come across an example I don’t understand. A lighting circuit protected by a 6amp 60898 Type C (Ref Method 100) using 1.5/1.0 T&E is measuring out R1+R2 at...
  2. N

    R1+R2 and Zs calculate acceptable?

    hello 1.is that acceptable if i do only Zs test last point of the lighting circuit and on scoket! instead of measure R1+R2? i can caluclate R1+R2 ACTUALY! ZS-ZE=R1+R2 is it acceptable to write the value on certificate? 2. as i know the maximum Zs by rcd (rcbo)protected circuit 1667 ohm...
  3. M

    Partial testing and R1+R2.........

    So when doing partial testing, when doing ring circuits i have a query. Do end to end prove each conductor is a ring. In the area on the test sheet it says r1+r2 OR r2. Is it ok to do end to end and fill in the cpc end to end reading (r2) into this box and do zs of every socket to not only get...
  4. M

    Domestic High R1+R2 but acceptable Zs

    Hi everyone. Did a test last week and sorting the paperwork. On the downstairs lighting circuit I got an R1+R2 reading of 3.35 but a Zs of 0.90. Normally I'd go looking for a loose connection somewhere myself but the company I work operates in a way where I've got a limited time to do the...
  5. Baddegg

    R1+R2 of zero zilch nothing?......

    Testing R1/R2 on 10mm/4mm T&E cable and the reading is 0.00? Never had this before, can I record 0 on the cert?
  6. A

    Help or advice with r1+r2 ring.

    So I’ve finished a rewire recently and I’ve come to testing the ring circuit for the down stairs sockets and I’m not getting what I’m testing in regards to the calculation LL: 0.36 NN:0.36 EE:0.60(there abouts) Now when I’m doing the r1+r2 crossing the opposite live and earths but the...
  7. M

    Low Ze, high(ish) R1+R2, Got a plan but just had an idea

    So Ze=0.02 and R1+R2 = 0.73 on a first floor ring main. Nearest submain is about 35m away, so that Ze's plausible, and even a slightly indirect route makes Ze=0.03 realistic. So MCBs are going to need changing to Type Cs. Unfortunately for that first floor ring R1+R2 of 0.73 is too high for a...
  8. MFS Electrical

    Megger MFT 1720 R1+R2 setting

    anyone else got one? Ever used the R1+R2 setting? Was testing a socket circuit for a minor works yesterday fed from a 36 way TP&N DB Everything except the fire alarm was wired in singles through trunking absolutely none of the earths were remotely near the terminals that they should have been...
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