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  1. The Mains Man

    RCCB making the Zs higher than it should be

    after finding an unexpectedly high Zs on a shower, I narrowed it down to: Zs at input of RCD (RCCB) is around 0.18 as would be expected but the Zs at the output of the RCD is 0.96! Both tests done with 3 lead low test on Megger MFT with 3 month calibration. It is a split load board and both...
  2. Colin McLachlan

    Domestic New single light circuit tripping RCCB on socket circuit.

    I'm not an electrician, but have been successfully doing DIY electrical work for 50 years, including complete house rewiring before the days of RCCBs. I've just moved to a house built in 2000, and one cupboard (ironically the one with the consumer unit in it) does not have a light. I installed...
  3. Marcus Vaughan

    Crabtree RCCB not tripping -help!

    Hi all. So the Crabtree old style in my hand failed the I delta n test (times 1). But passed the 5 times test. So I have replaced it with the one in the board. Supposedly reconditioned - and that’s failing both tests but mechanical works. I am wondering if I am missing something here with my...
  4. M

    Wanted [South] Crabtree rccb 80a 30ma old type

    wanted, anyone got one please?
  5. M

    Siemens RCCB 5 SM1312 25A 30mA

    I have a Siemens RCCB 5 SM1312 25A 30mA and my Fan Assisted Cooker/Grill keeps triggering it. When I first switch on it is fine then after a minute or two the RCCB is triggered and cuts the power. Someone has told me to increase the relevant breaker from 25A to 32A. Could this be a solution...
  6. D

    Cooker install - RCCB tripping

    Morning all, I'm Having an issue with a cooker install and wonder if anyone can help. Every time the cooker is switched on there is a RCCB trip (Rated at 80a 30Ma). The circuit will take a supply but no load of any kind. I connected a DeWalt charger to the socket on the cooker plate (only...
  7. L

    For Sale [East]: For sale: Crabtree rccb 80A 30mA

    Lots available... Make sensible offer. Post or collection available. Also have loads of RCDs.
  8. C

    Crabtree RCCB and ZS testing

    Hello All, After a bit of help regards ZS testing on a Crabtree Starbreaker board. Have replaced 2 lengths of dado trunking in our office block at work and the measured ZS is coming out much higher than the calculated value. Section 1 - calculated 0.5 ohms, measured 1.92 ohms. Section 2 -...
  9. Electron

    Does Wylex RCCB meet Regulations?

    A customer wants a house refurbished. Attached is a photo of the existing Consumer Unit. three circuits are protected by an RCCB (an old type of RCD) and two aren't. I have recommended a new Consumer Unit with full RCD protection. Is there any way the existing can be made to conform?
  10. F

    Help with RCCB please

    Hello everyone, New here I’m not an electrician but I have an interest, RCCB was tripping at least 3 times a day I couldn't find a fault so I replaced and it seemed to have solved the issues, but 3 days later the RCCB on the other side has tripped, dos anyone have any ideas please? I'm so...
  11. O

    Old Crabtree RCCB replacement?

    Hi, does anyone know off hand if any of the newer Crabtree RCDs will fit this board? Need to replace it & can only find the 100ma ones. Thanks
  12. S

    RCCB tripping when under load problems

    Hello I am new to the forum and was hoping I could pick your collective brains. I am an electrician with 7 years experiance. I have mainly worked for the MOD and on commercial and industrial builds throughout my time. I now do the odd bit of domestic work and need some help on a kitchen ring...
  13. A

    RCCB 100a type s on a TN-S

    i come across this today and it does not sit well with me. so im after a little advice. its a TN-S system Ze 0.12 and Zsdb 0.16 there a type S 100A rccb as a main switch with no RCD's up stream, This does not sound right to me and all the MCB's are C type. all my I.R were greater than 2k except...
  14. M

    Introduction (belated)

    Hello, Just a little about myself. I am currently in the Information Technology Field with a focus on the rapidly developing Internet-of-Things (IoT) market. Personal electrical experience in the UK, the US & Canada. Continuously intrigued by the history of how differing electrical standards...