EICR - main earth and neutral

BNO - the unicorn like Building Network Operator, which may just be a slightly bemused freeholder and his/her tame sparks, should be working to BS7671. The DNO stuff stops in the basement at the company fuses.


In a typical block owened by a freeholder but with a few leasehold flats within, anything between there and the flats meters, i.e. riser cables, laterals sub-mains and red links is considered to be 'building network' these days. Still has to be secure against abstraction, but often the maintenance of it is a responsibility void until something goes wrong.

Often done in split con, sometimes by DNO originally, and then adopted. Newer flats and conversion are more likely to be SWA, or at the small development shallow end just 10mm2 T and E, though to be fair T and E  is more likely with centrally located metering, so the meters are not in the flats, but in some awkward  common cupboard or  basement and they have flat numbers and rude messages telling you what will happen if you turn off the isolator for flat 13  written on them in sharpie pen..



Mike.

BNO - the unicorn like Building Network Operator, which may just be a slightly bemused freeholder and his/her tame sparks, should be working to BS7671. The DNO stuff stops in the basement at the company fuses.


In a typical block owened by a freeholder but with a few leasehold flats within, anything between there and the flats meters, i.e. riser cables, laterals sub-mains and red links is considered to be 'building network' these days. Still has to be secure against abstraction, but often the maintenance of it is a responsibility void until something goes wrong.

Often done in split con, sometimes by DNO originally, and then adopted. Newer flats and conversion are more likely to be SWA, or at the small development shallow end just 10mm2 T and E, though to be fair T and E  is more likely with centrally located metering, so the meters are not in the flats, but in some awkward  common cupboard or  basement and they have flat numbers and rude messages telling you what will happen if you turn off the isolator for flat 13  written on them in sharpie pen..



Mike.