Earthing - Interlogix ATSx500A Series Installation And Programming Manual

Chapter 2: Installation

Earthing

WARNING: The correct earthing procedures must be followed.
Earthing of one cabinet containing several devices
All devices designed for the system have earth connections via metal studs to
the metal housing. Make sure that these metal studs make good connection to
the housing (beware of paint). The earth connections of every piece of equipment
in the system can be used for connecting the screen of shielded cables.
If a device is placed in a plastic housing the earth lug of the device does not have
to be connected.
Earthing panels in a single building
In one building several cabinets or devices are earthed to a safety ground.
The safety ground for the building must be checked by a licensed contractor.
Earthing panels in more buildings
If the wiring extends to separate buildings, more than one common earth system
will be used. Use ATS1740 isolator/repeaters to isolate the system databus. In
this way the system is protected against variations in earth potential.
20 Advisor Advanced ATSx500A(-IP) Installation and Programming Manual