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[42+] Telephone Junction Box Wiring Diagram
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How To install a BT78A Telephone Junction Connection Box to join up to
![[42+] Telephone Junction Box Wiring Diagram](https://i.ytimg.com/vi/p9eCINjjbh8/maxresdefault.jpg)
[42+] Telephone Junction Box Wiring Diagram
How to wire a phone extension from a BT Master socket UK - YouTube