{"product_id":"3-gang-35mm-triple-galvanised-steel-back-box","title":"3 Gang 35mm Triple Galvanised Steel Back Box","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge 3-gang 35mm galvanised steel back box mounts three separate 1-gang wiring accessory plates side by side in a single continuous wall aperture. The box measures 244mm wide by 73mm high, with a 35mm recessed depth behind the wall surface, and is constructed from 1mm-thickness galvanised steel to EN 60670 standards.\u003c\/p\u003e\n\u003cp\u003eDesigned for residential and commercial installations where three separate switches, sockets or data plates need to be grouped together, the box accepts standard 86 x 86mm faceplates only. Six fixed mounting lugs provide screw-fixing points for the cover plates, while earth terminals on the back plate ensure continuity across all three outlets. Pre-formed 20mm knockouts on the sides and base allow cable entry from multiple directions without drilling.\u003c\/p\u003e\n\u003cp\u003eThe galvanised steel construction resists corrosion in plasterboard and brick cavity walls, and the 35mm depth accommodates standard switch mechanisms and socket terminals without requiring deeper recessing. The box ships bulk-packed in shrink-wrapped Knightsbridge trays, with a 25-year warranty covering material defects and construction failures.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e73 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e244 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecessed Depth\u003c\/td\u003e\n\u003ctd\u003e35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEarth Terminal\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_2795629_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat plates does this box accept?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe box is designed for standard 86 x 86mm wiring accessory plates only. It will not accept larger grid plates or non-standard sizes. Each of the three positions accepts one 1-gang plate, giving configurations such as three separate light switches or a socket plus two data plates.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat depth of wall cavity is needed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA minimum 35mm cavity depth is required to recess the box flush with the wall surface. On stud walls with 50mm studs or deeper brick walls this poses no issue, but shallow partition walls may need to be checked before cutting the aperture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the knockouts removable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 20mm knockouts are pre-formed but not removed during manufacture. They can be punched out with a screwdriver or knockout tool during installation to allow cable entry. Any unused knockouts should remain in place to maintain the box integrity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the box include fixing screws?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Wall fixings and screws are not included and must be sourced separately depending on the wall construction. The six mounting lugs on the box are threaded to accept M3.5 screws for attaching the cover plates.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293883457803,"sku":"GSK335","price":1.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/177346_4aa8105a-47ae-4699-b5d5-cee60c7e9cbc.jpg?v=1714665494","url":"https:\/\/niori.co.uk\/products\/3-gang-35mm-triple-galvanised-steel-back-box","provider":"Niori","version":"1.0","type":"link"}