My guide to installing a New Style BT OpenReach NTE5c Telephone Master Socket … New Version.
A circuit diagram of the BT OpenReach NTE5c Telephone Master Socket.
C1 = 1.8μF Capacitor
R1 = 470KΩ Out of service resistor
R2 = Bell Wire Resistor/Choke (Colouring says ?Ω – meter reads 77Ω)
Inside the NTE5c Telephone Master Socket 5c. Components from left to right. R1, service resistor, R2, bell wire resistor, C1, ring 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:-
- Never strip any wires going into the IDC connectors.
- Always connect to the next available bit of fresh, unused wire.
- The wires on A, B, 2 (3*) and 5 on your current socket will be going to the same positions on the NTE5c.
* 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 on the extension socket requires a ring capacitor, use a decent microfilter that contains the ring capacitor.
Incoming cable … Always connect to the next available bit of fresh, unused wire. Cut used/damaged cable off.
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.
On the newer MK2 version of the NTE5c, they now have clear cam-locks so you can see that the cables are correctly placed.
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.
NTE5c Telephone Master Socket – test socket. Note; your extension wiring will not be connected when the lower-half face-plate is removed.
NTE5c Telephone Master Socket – finished.
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.
Clear on NTE5c MK2.
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.
If your extension wiring comes in through your backbox, route the cable as shown in the 2 pictures below – running the cable along the bottom of the socket, then out the right-hand side of the hole.
Rear view of extension wiring.
NTE5C fitted, finished.
Below is a mock up of NTE5c and VDSL MK4 filter used to – this is the best option if you wish to have the broadband used anywhere except at the master socket.
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
3 = Orange with white rings – Don’t connect for best internet speeds.
4 = Not on new sockets, or
5 = White with blue ring
If your telephone does require a ring capacitor, use a decent microfilter that contains the ring capacitor.
Can be bought on Amazon for about £8. http://amzn.to/2pt2CZn