For most socket circuits, 2.5mm² twin & earth is used: on a 32A ring final or on 16–20A radials depending on design and run length; confirm against BS 7671 and local conditions.
Wiring cable for lighting and power: twin & earth and flex explained
This range covers low‑voltage wiring for fixed installations, including twin & earth in common sizes such as 1.5mm for lighting and 2.5mm for socket circuits, plus 3 core flexible leads (including heat‑resistant variants) supplied in handy short length coils. Products are rated for building wiring at 300/500 V to BS 6004, with typical 70°C service temperature for twin & earth and up to 90°C on specified heat‑resistant flex. Use these cables to connect lighting points, switches and power outlets in dwellings and light commercial settings.
Cables can be run clipped direct, routed neatly in Trunking & Conduit, or terminated into Socket & Switch Boxes and surface accessories. Where clips are required, secure runs with Cable Clips and follow UK wiring rules to support wiring so it won’t collapse in a fire; metal fixings are required in access and egress routes under the 18th Edition. For external or sun‑exposed runs, protect PVC twin & earth in suitable containment, as standard PVC sheaths are not designed for prolonged UV exposure.
The flat profile and harmonised core colours make installation straightforward and compatible with everyday accessories such as Switches, Sockets & Plugs and Light Fittings. Heat‑resistant flex is suited to final connections on ovens, hobs or immersion heaters (always size by load and route), while twin & earth serves ring and radial circuits when installed to BS 7671.
Electrical Cable FAQ's
Standard PVC twin & earth isn’t intended for prolonged outdoor exposure; where an external route is unavoidable, enclose and protect the run (e.g., in conduit or trunking) to mitigate weathering and UV.
Yes—UK wiring rules require wiring systems to be supported so they won’t fall in a fire; non‑metallic clips alone are not acceptable in access/egress routes. Use metal fixings or containment accordingly.
Use heat‑resistant flexible cable specified for higher temperatures (commonly 90°C rated types); size by appliance rating and the installation method, and follow the manufacturer’s instructions.
Both methods are used: twin & earth may be clipped direct where permitted, or installed within trunking/conduit for mechanical protection or appearance—choose based on location and compliance.