Telephone & Broadband Blog
How to install an New Style NTE5c BT / OpenReach etc Master Socket – replacing NTE5a
by DAVE FRY on JANUARY 22, 2017
My guide to installing a New Style BT OpenReach NTE5c Telephone Master Socket … New Version – *work in progress*
C1 = 1.8μF Capacitor
There are 3 components in the NTE5c master sockets now – the Ring Capacitor, Test Resistor and a bell wire resistor/choke. These components are all on the back plate of the NTE5c – as is the extension wiring – but the extension wiring remains disconnected from the line until the lower half faceplate is plugged in. Master sockets have not contained the Surge Protector since around 2012 as these can cause issues with Fibre BroadBand.
When fitting any new socket:-
* 3 is used to carry the ring signal, but is known to cause issues with broadband. I personally never use as most modern phones don’t need this – if your telephone does require a ring capacitor, use a decent microfilter that contains the ring capacitor.
To connect the incoming line place the clean un-stripped cables in the A and B connectors as shown, making sure the cables pass through both holes and go right to the back of the cam-lock IDC connector. These will be the same 2 cables you removed from A and B on your current socket.
Making sure the wires stay in place, now close the cam-lock IDC fully. If you need to open this cam-lock for any reason you need to cut off the used bit of cable then follow the above again. Never re-use the same section of wire in any IDC connector.
If you have no extension wiring to install, screw this unit to your backbox then test using the test socket, see picture below, or just clip the lower half faceplate and use as normal.
Note: Even though the extension wiring is now in the main body of the NTE5c, it will remain unconnected from the phone line until the lower half face-plate is installed.
To install the extensions cables, again used clean un-stripped wires in the 2 and 5 connectors as shown, making sure the cables pass through both holes and go right to the back of the cam-lock IDC connector. These will be the same 2 cables you removed from 2 and 5 on your current socket. Again, on the newer MK2 version of the NTE5c, they now have clear cam-locks on the extension IDC’s so you can see that the cables are correctly placed.
Important. If you have 2 extensions coming from your current master socket, note these will both need to be placed in the cam locks at the same time and on top of each other, make sure they’re not twisted as this will damage the IDC.
If your extension wiring comes out the front of the socket, it just comes straight down, there is a cut out in the lower half faceplate to accommodate this.
Standard incoming BT line (drop wire)
Standard incoming BT line (drop wire) – Close up. The Steel Tension Cables can be other colours, but all 3 are always the same colour.
The NTE5’s come with 2 choices of mounting screw. If using a plastic backbox without any metal in the mounting holes, use the self taping screws, otherwise use the machine screw – the machine screws are also for use on the metal back box sunk into wall.
Wiring extension sockets on the faceplate:-
2 = Blue with white rings
If your telephone does require a ring capacitor, use a decent microfilter that contains the ring capacitor.
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