Table 14.
An extension bell may connected the installation connecting the
two bell wires terminals and telephone socket.4 and 0. Terminals and
6 are Frequently Unused, and Therefore Four-Core Cable May Normally Be
Installed.10 Telephone Cable Identification
Code Base colour Stripe
G–W Green White
B–W Blue White
O–W Orange White
W–O White Orange
W–B White Blue
W–G White Green
Table 14.68mm cross-section.11 Telephone Socket Terminal Identification.10 and the individual terminals in
Table 14. The conductors should connected shown Fig. 14. The extension bell
must the high impedance type having REN rating. All equipment
connected exchange line must display the green circle approval.
The multi-core cable used for wiring extension socket outlets should
be type intended for use with telephone circuits, which will nor-
mally between 0. Telephone cable
conductors are identified Table 14.62.11.62
Telephone circuit outlet connection diagram. Terminal the Incoming Exchange Line, Only Used PBX
Line for Earth Recall
Socket terminal Circuit
1 Spare
2 Speech circuit
3 Bell circuit
4 Earth recall
5 Speech circuit
6 Spare
.Basic Electrical Installation Work
344
capacity REN and therefore, the total REN values all the connected
telephones must not exceed four they are work correctly.
Incoming
exchange
line
To next
secondary
socket
Master socket outlet Secondary socket outlet Secondary socket outlet
1 G–W G–W G–W G–W
G–W
B–W B–W B–W B–W B–W
W–B
W–G
O–W O–W O–W O–W O–W
W–O W–O W–O
W–B W–B W–B W–B
W–G W–G W–G W–G
2
4
5
6
3
1
2
4
5
6
3
1
2
4
5
6
3
Multicore cable
FIGURE 14
