2N Lift emergency phone 2N SingleTalk - Manual, 1514 v6.3.0 - Manual (Page 21)

Mounting
– Universal version
2.3
20
2.3 Mounting
– Universal version
Safety Precaution
Safety
 The telephone line supply cable, microphone, loudspeaker, LED indicators,
ALARM button and CANCEL contact, including cabling, and the board with
electronics are connected with a telephone line and so remember to
ensure during installation that the user cannot touch these product parts
and is protected against an electrical accident by a minimum isolation
distance of 1.5 mm, or an isolation barrier of a minimum break-down
voltage of 1,500 V!
Caution

The location, appearance and designation of the communicator controls
(e.g. the ALARM button) have to comply with the applicable lift standards.
ST Location
ST may be mounted into any position as needed, the optimum elevation being
approximately the height of an adult’s mouth. The ST mounting place must be beyond
the reach of the operating personnel (see the Safety Precautions).
Caution
 You are not recommended to mount the electronics without the mounting
panel because the panel works as an electric isolation barrier and the
manufacturer cannot guarantee safety if it is not used.