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high zs

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  1. S

    Can Rcd Compensate For High Zs

    hi currently doing remedial works on a commercial office. I have a lighting circuit on a 6 amp mcb type B within a split load board covered by a 63amp 30ma Rcd . I have taken a zs reading of 750 ohms from a light which is too high . The existing installation is taking its earth from metal...
  2. R

    High Zs on ring final circuit

    Good morning, I was recently at a job and had a discussion with another Electrician regards a high Zs reading on a ring final circuit. R1+R2 measured 1.68ohm Ze 0.18 Tncs This puts the circuit over the permitted zs. I begun seeking out the issue. However the other electrican said...
  3. D

    minor works high Zs Values

    test, cant seem to post????
  4. G

    High ZS values on rewire

    Hi all, Only recently joined the forum, and thought i would get some views on the following. Just wondered if anybody has had the following issues when fitting a new ccu. Recently completed a rewire, including new new metal ccu, completed all dead tests ok, however upon live tests i got high...
  5. A

    High Zs values

    Just had a installation condition report done on my house in prep for selling it. It's an old installation, possibly thirty years plus with newer bits that I did in the late 90's. It showed up some high Zs results on the living room sockets which are on the same circuit that the dining room and...
  6. M

    High Zs on lighting circuit

    Hi all I have a house where all the circuits meet the Max Zs for that circuit yet the lighting circuit is testing as 747 ohms Zs It looks like it used to be a TT system and been converted to a TN-C-S system. As its also got an main tcd before the board. Could this somehow be causing this high...
  7. S

    High Zs readings

    Hi everyone Apologies if this is a dim question.... I have just installed an exterior dusk till dawn lamp at home and all was fine until I carried out the Zs test. I have a TN-S system with a Ze of 0.66ohms. The R1+R2 reading at the lamp was 0.58ohms. My Zs reading is however 2.88ohms. I tested...
  8. dlt27

    High zs on RCD's.

    Hi all. I carried out an EICR yesterday. It was a BG split load consumer unit and when testing I noticed the zs values were coming out high. I noticed on the 1 rcd there was 0.50 Ohms difference between feed and load side of rcd and on rcd 2 there was 0.60 Ohms difference. Just wondered if...
  9. S

    High zs reading on a radial circuit

    I have a high zs reading of 312 ohms on a radial circuit, r1+r2 is 1.82. Earths seems fine in the sockets....any suggestions?
  10. T

    High zs tripping mcb?

    First of all readings from kitchen ring circuit are as i remember insulation resistance all well above 2 meg now!problem i had was extension had flat roof and cable was damaged between two points replaced damaged cable but still mcb not rcd as they aint got one is breaking.this was when no load...
  11. T

    High Zs on LED Downlights

    Hi Everyone, I am a new member on the forum! (Although I have for long read through the various topics) I have just recently completed and passed successfully the 2394/2395 C&G exams. I had been testing for a good few years but finally managed to get the funds to take the proper courses...
  12. J

    High Zs reading!

    Guys, request advice. I was recently carrying out remedial work on 2x Ltg cts reported on EICR as having very high Zs value. When I retested the measured Zs was 44.8 and 42.6. These are on a TNC-S system and Crabtree C50 5a MCBs. These would appear to be readings expected of a TT System! I...
  13. D

    High zs readings low ze readings

    Hello I've recently been called to a job regarding high earth fault loop readings through out the house they've got an old style mk consumer unit with a 30ma 60a main switch mk LN5760 the supply side of the rcd had good readings and but the load side readings were more than double that of the...
  14. T

    high Zs on 110v

    hi all, In a bit of a pickle ,got niceic audit imminent ,and i have some exccesive readings from a 110v transformer backed up by 60898 type c 16amps mcb acording to BS7671 pg 61 41.6 max is 0.34 .can change to a type B to get max 0.69. these reading s are from another tester ,who...
  15. yellowvanman

    Very High Zs and RCD not tripping

    Did an EICR today, Ze was 500ohms! Went through the whole process though. There is an up front time delayed 100mA RCD and a 30ma RCD protecting the sockets - 16th Edition board. 100mA trips ok at x 1 30mA trips ok at x1 but not at x5. It does trip at 100mA. Could it be that the very high...
  16. K

    High Zs's on a Genny

    Right Ladies and Gents I would appreciate your input on this one, I've been asked by a customer to repair some defect highlighted by a recent EICR carried out by a large industrial inspection company. The plant in question is fed from a 200kVA Genny. 4 of the defects are related to high Zs...
  17. P

    High Zs Reading on Megger MFT 1552

    Can somebody help me please? I'm just finishing a rewire, and I've installed a GF radial cicuit in a large domestic property and am in the process of testing it. It's a new radial circuit, 2.5 T&E, 13 sockets, 20A type B breaker on an RCD protected board. My R1&R2 = 1.40 and Ze = 0.20, so my...
  18. N

    High Zs On TNS

    Was looking at someones consumer unit today as a favor and took a ze reading of 10 ohm on what i assume to be a TNS - 6mm earth from terminal to metal casing on the DNO fuse carrier (no link from neutral to earth) It is only about 500mm long so upgrading to 16mm wont improve much i don't think...
  19. M

    Very high Zs reading

    Good evening all. I wonder if anyone could give me a steer as to why I am getting very high Zs readings. I have been testin a circuit that has a R1+R2 of 0.23 ohms but I seem to be getting Zs reading on L-E of + 40ohms. L-N is coming in at 0.2ohms. The incoming fuse is a 63amp BS1361 an RCD main...
  20. M

    very high zs

    hi everyone, but stuck at the mo with a zs of 6.49ohms. simple job of fitting spur to existing ring. all other sockets on the ring are also 6.49 ohms. the normal ring health checks are good with ratios maintained throughout. initial thought was poor distributor earth. ze checked out at 150 ohms...

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