All Metal Consumer Units – Wiring Regulations Amendment 3
The BS 7671 : 2008 17th Edition IET Wiring Regulations Amendment 3 :2015, Regulation 421.1.201 prescribe that within Domestic (household) premises, consumer units and associated switchgear assemblies (enclosures), are manufactured from non combustible material or enclosed in a non combustible cabinet/enclosure and comply with product standard BS EN 61439-3.
The purpose of the new regulations is to reduce the risk and limit the spread of fire from consumer units due to faulty components or poorly installed components.
Domestic (household) premises include houses, bungalows, flats, apartments, student lets, sheltered accommodation, static homes, home offices, and attached garages etc. Other types of property that are classed as commercial, and you may wish to consider using all metal consumer units for are :- Nursing Homes, guest Houses, bed and breakfast houses and hostels, etc.
Regulation 421.1.201 requires all designs for new installations from July 1st 2015 to be to the new standard, between July 1st and end of December 2105 installation of ‘all metal’ consumer units is optional unless designed after July 1st, from Jan 1st 2016 ‘all metal’ consumer units must be installed in domestic premises unless designed before July 1st 2015, in which case choice of metal or plastic is optional.