The extension bell
must the high impedance type having REN rating.
An extension bell may connected the installation connecting the
two bell wires terminals and telephone socket.
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. 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
.62.4 and 0. 14.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. Terminals and
6 are Frequently Unused, and Therefore Four-Core Cable May Normally Be
Installed.
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 14.10 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 14.62
Telephone circuit outlet connection diagram.11. All equipment
connected exchange line must display the green circle approval.11 Telephone Socket Terminal Identification. The conductors should connected shown Fig.
Table 14. Telephone cable
conductors are identified Table 14.68mm cross-section.10 and the individual terminals in
Table 14
