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i tested at the terminal screws on the rcbo, also on the terminals of the shower. I will try the jumper wire idea & see what happens.   :signthankspin:

yes, even double checked before i left, 

I tested both at the rcbo & shower (also hob isolator & socket outlets ref other existing two rcbo's) Yes the earth fly leads are connected

Hi Guys installed new circuit for shower (7.8kW 230v/8.5kW 240v) in 6mm today. I also installed a mem alb321 rcbo. Test results were r1+r2 0.07, I/R 500+ Zs 39.68. RCBO test button works but fails to trip during test. I removed the load & tried RCD test again but no trip.  Installation is...

 Anyone please advise how to upload pic's??  thanks

Batty - i don't know? i personally think that previous electrician converted system into TNCS himself. however if DNO confirm TNCS supply available from their end then i will upgrade main earth to 16mm & connect to MET and remove rod & 6mm earth. Advise that water bonding needs...

No, there is only one supply & one cut out fuse. The TT DB & TNCS DB2 are fed from meter via henley block, the TNCS night storage DB3 is fed from meter & neutral from henley block.

Thanks for your response,  Connecting straight to the TNCS supply was my first thought, but i've had in the past a similar situation but with only one DB, although the Ze was good reading both TT & TNCS the DNO said that there was no facility to convert to TNCS their end. Hence why i've...

Hi Went to property today to do EICR that has x3 DB's, DB1 with x7 mcb's, 80a 100mA Earth leakage circuit breaker on a TT system with 6mm earthing conductor, 6mm water bonding. DB2 with x2 mcb's 100a 30mA RCD MS feeding shower & electric heater on TNCS system with 16mm earthing conductor...

Guys, firstly thanks for your help & advice (points duly noted & taken on board), The customer has had no more tripping since i left tuesday evening. (very strange as it was happening several times a day prior to my arrival although via testing i couldn't find anything wrong) my friend...

Kme - I'm back on site 2moro, I will then post results of all circuits, any installation with single 30ma upfront will not comply, so either 100mA with additional 30mA (s) or all rcbo's is ideal solution for TT, point taken ref solar pv, I will phone manufacturer tomorrow ref solar installation...

Canoeboy, 4mm t&e direct from mcb 2 rotary isolator & then into solar unit, sorry not on site 2day so can't take pic's Doc H, il disconnect L N E from 1 circuit at a time & see what happens, Thanks

Hi, solar pv installed approx 6mths prior 2 tripping starting, being honest don't know anything about solar installs. IR Tests are all 500M, ref rcd, don't no why 30mA & not 100mA, this is condition when I arrived, if I replaced with 100mA surely I'd then av 2 advise additional 30mA...

Hi, customer suffering with nusiance rcd tripping since last september, TT system with 80a 30mA rcd main switch, 16mm tails & 9 circuits, (cooker 20a, ring 32a, ring2 32a, lights up 6a, lights down 6a, garage 32a, solar pv 16a, heating 16a, microwave 16a) 6mm main earth, 10mm bonding to gas...

thanks for your help, much appreciated

Steve 3948, although its a flat roof, id say the gap is at least 18 inches all over. The existing lights have been in over 5 years with no problems till now, i will try new transformer & lower wattage bulb & see what happens, cheers once i swapped everything over it worked fine hanging...

Ok thanks Sharpend, i will try another transformer first & go from there. If no joy then might have to look at 230v option

Hi Customer has x5 12v down lights in kitchen, each with there own transformer. 1 of them stops for approx 10/15 minutes then comes back on. I have checked all connections for tightness & transformer to ensure not wrapped in insulation yet same issue. I then replaced the transformer...

it would of been modification to 3 of the circuits in a 6 way board. However he has now pulled the plug on the whole kitchen refurb, bearing in mind he was gonna spend ova 10k on kitchen so a couple of hundred on electrics!!!! need i say anymore