Unless you think BS7671 includes DNO meter boxes!

Surely BS 7671 covers everything after the supply terminals, whatever it happens to be? I presume the KMF will be after the meter.


I guess the meter box isn't of itself made of non-combustible material. 421.1.201 applies to 'domestic (household) premises' - so I guess it's down to whether you think something within the outside leaf of a wall counts as part of the premises. The normal dictionary definition usually includes all buildings and land - but the usual BS 7671 interpretation generally excludes things fully outside of a habitable building (such a detached outbuildings). So definitely vague to my mind.


If the house is of conventional masonry construction with nothing but another brick wall behind the meter box the risks are probably low, but if it was say timber frame with nothing but breather membrane, softwood and PIR/PUR foam insulation behind the meter box, I might not be quite so confident. So generalizations can be difficult. What about masonry construction but with flammable cavity fill?


   - Andy.

Unless you think BS7671 includes DNO meter boxes!

Surely BS 7671 covers everything after the supply terminals, whatever it happens to be? I presume the KMF will be after the meter.


I guess the meter box isn't of itself made of non-combustible material. 421.1.201 applies to 'domestic (household) premises' - so I guess it's down to whether you think something within the outside leaf of a wall counts as part of the premises. The normal dictionary definition usually includes all buildings and land - but the usual BS 7671 interpretation generally excludes things fully outside of a habitable building (such a detached outbuildings). So definitely vague to my mind.


If the house is of conventional masonry construction with nothing but another brick wall behind the meter box the risks are probably low, but if it was say timber frame with nothing but breather membrane, softwood and PIR/PUR foam insulation behind the meter box, I might not be quite so confident. So generalizations can be difficult. What about masonry construction but with flammable cavity fill?


   - Andy.