- Reaction score
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Been to quote for a job this morning, The house has 2 CU's one is eco7 for 5 storage heaters, the other was upgraded in 2009 and all wylex rcbo's. Meter tails, bonding all up to scratch, the DNO upgraded the cutout to PME in 2009 with the previous work.
The owner is going to have the heaters replaced with more modern efficient ones and do away with the eco7 to have single tariff, The ec07 is old wylex rewireables and wants it updated.
So I intend to replace the plastic main Cu with a larger metal one, incorporating all circuits into this, utilising existing main switch and rcbos where possible, i then only need 5 rcbo's for the heater radials. and a larger CU shell. Not sure on what rating rcbo's yet as I need to know what heaters are fitted.
However, what i noticed made for interesting reading, he pulled out the old paperwork for the Cu change in 2009 and the invoice/paperwork from dno for the PME.
The person who did the work previously replaced the CU, installed type C rcbo's, changed tails, bonding etc but failed to record or bother doing any r1, rn, r2 or R1+R2/R2 tests! the certificate has blank spaces! makes me doubt its worth..
Thoughts on the existing type C rcbo's.. my normal approach would be for type B's. I did some tests this morning and the Zs, Ze and IR appear okay. I didn't test all the circuits as i will be going in once the heaters are fitted by the German outfit end of June. All circuits are quite short and testing showed good Zs results and within allowed for type C. A type B would give higher allowed Zs so not sure why he didn't fit them in 2009??
end to end on rings is okay, slight variance between line and neutral, likely a loose connection..
Question is to what extent am i responsible for previous circuits if im not changing the rcbos, merely putting them in a new enclosure, im fully respsonsible for the new ones i add and circuits I connect up.
Thoughts and ideas?
The owner is going to have the heaters replaced with more modern efficient ones and do away with the eco7 to have single tariff, The ec07 is old wylex rewireables and wants it updated.
So I intend to replace the plastic main Cu with a larger metal one, incorporating all circuits into this, utilising existing main switch and rcbos where possible, i then only need 5 rcbo's for the heater radials. and a larger CU shell. Not sure on what rating rcbo's yet as I need to know what heaters are fitted.
However, what i noticed made for interesting reading, he pulled out the old paperwork for the Cu change in 2009 and the invoice/paperwork from dno for the PME.
The person who did the work previously replaced the CU, installed type C rcbo's, changed tails, bonding etc but failed to record or bother doing any r1, rn, r2 or R1+R2/R2 tests! the certificate has blank spaces! makes me doubt its worth..
Thoughts on the existing type C rcbo's.. my normal approach would be for type B's. I did some tests this morning and the Zs, Ze and IR appear okay. I didn't test all the circuits as i will be going in once the heaters are fitted by the German outfit end of June. All circuits are quite short and testing showed good Zs results and within allowed for type C. A type B would give higher allowed Zs so not sure why he didn't fit them in 2009??
end to end on rings is okay, slight variance between line and neutral, likely a loose connection..
Question is to what extent am i responsible for previous circuits if im not changing the rcbos, merely putting them in a new enclosure, im fully respsonsible for the new ones i add and circuits I connect up.
Thoughts and ideas?