BG Semi Blind Grommet is ideal for use with metal consumer units. 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), is manufactured from non combustible material or enclosed in a non combustible cabinet/enclosure and comply with product standard BS EN 61439-3 standards. Features cable retention, negates requirement for additional tails clamp, all products are self-extinguishing. The grommet satisfies IP4X, minimum requirement as per NICEIC Guidelines for all cable entry and exit on horizontal planes.