User Guide

13
INSTALLATION REQUIREMENTS
In order to maintain the independent approval of this unit, it must be installed such that clearance and
creepage distances shown in the table below are maintained between
The unit and any other assemblies that either use or generate a voltage shown.
Clearance
Xmm
Creepage
Ymm
Voltage used or Generated
by Host or other Cards
2.0 2.4 (3.8) Up to 50V rms or Vdc
2.6 3.0 (4.8) Up to 125V rms or Vdc
4.0 5.0 (8.0) Up to 250V rms or Vdc
4.0 6.4 (10.0) Up to 300V rms or Vdc
Note :
The Creepage distance is the shortest path between two conductive parts , or between a conductive
part and the surface of the enclosure measured along the surface of the insulation
The Clearance distance is the shortest distance between two conductive parts or between a
conductive part and the enclosure surface of the equipment measured through air.
The larger distance, shown in brackets, applies where the environment within the host is subject to
conductive or dry non-conductive pollution which could become conductive due to condensation.
In order to avoid any doubt, with regards to ensuring the AV Unit approval status is maintained, It is
recommended that the unit is mounted in the main security panel in
such a way that no control cards, expansion cards, power supplies etc. are within
10mm of its outer limits (see Fig 4)
Fig 4
Important : Where installation of the unit is required in a host which uses or generates voltages
greater than 300V rms or d.c., advice from a competent telecommunications safety
engineer must be obtained before installation.