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VR & Help Point
such as brickwork – in these cases use additional sealant around the
edges to ensure a weatherproof seal.
6. Connections
6.1. Standard Connections
Connect the telephone line A and B to the main terminal block CON1 as
shown.
The centre earth terminal is intended for connection to a local earth to provide
common mode protection from lightning transients.
If this terminal is not
earthed there is an increased risk that the telephone could be damaged
by line-born transients.
Note that user safety from the telephone network is provided by isolation and
does not rely on this earth connection.
Note:
Conductor sizes to be 0.5mm-2.5mm
2
(flexible cable); 0.5-4.0mm
2
(solid cable) The terminal block can be disconnected from the circuit board
for easier installation
Cabling must not infringe EC Low Voltage Directive (LVD) 2006/95/EC.
6.2. Supplementary Power supply
GAI-Tronics hands-free telephones can be equipped with a supplementary
power supply, required to power the induction loop (if fitted), external relays (if
fitted) and generally to provide increased audio output level.
The standard telephone does not require this supplementary supply for
normal operation, but note that ringing on exchanges with low ring voltages
(<40Vac) may be unreliable without a supplementary supply.
A
B
A
B
- +
Содержание 1090
Страница 23: ...VR Help Point 23 11 CE Declaration...
