In each cable, internal or external every single wire will be part of a pair. In BT-standard internal wiring, the blue wire with the white band around it should be matched with the white cable with the blue band. The orange and white with the white and orange, and the green/white with (fill in the blank…).

What Colour cables do BT use?

In each cable, internal or external every single wire will be part of a pair. In BT-standard internal wiring, the blue wire with the white band around it should be matched with the white cable with the blue band. The orange and white with the white and orange, and the green/white with (fill in the blank…).

What Colour are telephone cables?

PinUse1st Secondary Socket1Not used §Green/White2’B’ wire (-50V to earth)Blue/White3Bell wireOrange/White4Earth (PABX use only)White/Orange