If you're installing electrical devices like two-way lighting, use this three core and earth cable by Pitacs. It's suitable to use anywhere that you need permanent live cables as well as a neutral. You can also use this type of wiring in some central heating controllers or for timers on electric fans. It has three cores plus an earth, so multiple cores may be live at any time depending on how your lighting system or other device works, and whether it is currently switched on. The wires are colour-coded in black, grey and brown so you can easily identify them when installing your wiring. With the exception of the earth wire, they're all covered in a tough, insulated PVC sheath to protect them. The cable is 10 m long, which gives you plenty of reach for your electrical tasks. Selected products will qualify for FREE next working day delivery for online orders over 25 Pounds inc VAT and placed before 9pm Monday - Thursday or 6pm Sunday"