r1+r2 | Page 2

r1+r2

Recent contents View information Top users
  1. 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...
  2. 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...
  3. 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...
  4. T

    Ring main r1+r2 reading really low - 0.01?

    hi guys just wired up a new ring main for a house, confused on the test results though, firstly all other ring mains in the house that are new are okay and have came out as expected, tester has just been calibrated and batterys are okay and the ring main is a true ring... am using a metrel...
  5. A

    R1+r2 reading and r1,r2 and rn on ring final

    Hi there Been stuck on this for a while. What is the maximum r1+r2 reading possible on a lighting circuit in a domestic property. With a type b 6amp breaker. Also if you guys could tell me about r1+r2 and rn Maximum readings for ring final. Thanks
  6. Marcus Vaughan

    Zs-Ze = R1+R2 - doesn't it?!

    Hi all. The title is a slight red-herring to provoke a response.... Looking through previous threads here and elsewhere tells me that the formula in the title just isn't true - that you cannot just measure Zs at a socket outlet (live test) and subtract a measured Ze to get an R1+R2 value for...
  7. CDB

    Lighting Circuit r1+r2 values.

    Hi, I was doing my r1+r2 tests on a lighting circuit yesterday in a 6 bed house over 3 floors. Approximately 20 points not including switches. Mainly pendants but some light bars etc and almost all LED or low energy halogen type bulbs. Closed circuit r1+r2 values range from 0.88 on ground...
  8. B

    R1+R2 on a cooker circuit

    R1+R2 on a cooker circuit with a combined 13a socket is it ok to plug into socket and test between R1+R2 on plug in socket to get reading for cooker, I say yes but who I'm working with says face plate needs to come off
  9. S

    R1+R2 continuity both ways

    Hi. Testing an old lighting circuit today after a c/u change. First few readings were all fine. Then on one rose I got a reading of 0.5 ohms switch closed (fine) and 186 ohms switch open. Is this indicative of an insulation problem or something else? I did an IR test and got 0.75 ohms but it...
  10. R

    Expected R1+R2 for a spur

    hi all, quite a common situation i imagine. and the question out of curiosity, more than anything else..... if you have a ring-final, the expected resistance at any socket outlet on the ring should be approx (r1+r2)/4...yes? assume you're planning to run a spur off an outlet, how would you...
  11. L

    R1+R2 Values

    Hi all, Quick question when doing r1+r2 testing wether its a new install or a EICR, is there a table to show maximum readings we should be getting? Or is it a calculation? Thanks in advance Luke
  12. D

    high r1+r2 on lighting circuit

    Hi all, Strange one today that i've never seen before - hoping someone else may have seen this... Wiring an additional outside bulkhead today - couldn't easily get to the last fitting to take a switch wire from there so split the switch wire as close as i could to the fitting and wired in a...
  13. buzzlightyear

    no earth on lighting r1+r2 what do you put on sheet

    what would you put on test sheet r1+r2 no earths
  14. M

    (R1+R2) +\- tolerances

    Guys looking for some opinions here. for talking sake we have a rfc r1=0.62 rn=0.62 and r2 =1.03 ok excellent we have correctly configured rfc. onto (R1+R2) if going by the equation (r1+r2)/4 we end up with 0.41ohms obviously as we are testing we will be aware of the higher reading at Spurs...
  15. 1Justin

    Another good example why R1+R2 isn't equal to Zs-Ze.

    Be warned it you are tempted by shortuts. I know in domestic work on old houses, we often have a race against the clock, and it can get stressful and sometimes very difficult, but some cut corners could bite. I have just fixed errors left behind by NIC member who fitted new 17th ed'n consumer...
  16. N

    R1+R2 per metre - trying to test against book values.

    I find working as a labourer I never have to think about basic theory, so it's easy for me to forget. Doing some experimenting tonight with 11meters of 2.5 T&E and a continuity tester. End to end on the line 0.15ohm CPC 0.20 Ohm It's not exactly what I expect. Is the difference something to...
  17. Lee Gold

    R1+R2, Ze, Zs

    Hello can someone please explain in the most simplest way possible what r1 r2 Ze and Zs mean please. All I get on Google is a book full I just need to know what they are and what do they mean. And also earth loop? Thanks
  18. M

    Help me to Understand to get value of R1+R2

    This problem solving was on Virtual Scenarios (Ring Final Circuit) Getting Value of R1+R2 2.5mm and 1.5mm size cable used. 1st From the C.U. values of following connection L to L =0.27 N to N =0.27 CPC to CPC =0.45 2nd from the C.U cross the outgoing L to the incoming N and vice versa Measure...
  19. S

    r1+r2. calculate or measure...

    Please discuss...
  20. HappyHippyDad

    Is there a table of expected R1+R2 results in BS7671?

    Evening... I always use my OSG to find R1+R2 when needed for designing a circuit (staying withing the Zs limits), but I wondered if the same table is somewhere in BS7671? Its table I1 in the OSG. I've hunted high and low so I expect it's just something that the OSG offers and isn't in BS7671...

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top