I recently installed a new ring main and lighting circuit for my kitchen, including a new dedicated consumer unit. Just had the BCO spark round to do final testing, all is well apart from insulation resistance, which was found to be 11 Mega-ohm for both L and N conductors of the ring main.
Sparks tells me it's still a pass because the threshold is 0.5 Mega-ohm, however for a new installation he would expect nearer 200 Mega-ohm. Mentioned that it could be because wires have got squeezed in back-boxes, or could be residual damp from plastering (was plastered nearly 2 weeks ago). We agreed he'd come back in a few weeks and re-do the test.
In the meantime: anyone seen this before? Should I be worried?
Sparks tells me it's still a pass because the threshold is 0.5 Mega-ohm, however for a new installation he would expect nearer 200 Mega-ohm. Mentioned that it could be because wires have got squeezed in back-boxes, or could be residual damp from plastering (was plastered nearly 2 weeks ago). We agreed he'd come back in a few weeks and re-do the test.
In the meantime: anyone seen this before? Should I be worried?