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2.2 Installing the Advanced Hybrid System
32 Installation Manual
2.2.5 Connecting Frame Earth
IMPORTANT
Connect the frame of the PBX to earth.
• Be sure to comply with all applicable laws, regulations, and guidelines.
• Proper earthing is very important to protect the PBX from external noise and to reduce the risk
of electrocution in the event of a lightning strike.
• The AC cable's earthing pin may not be enough to protect the PBX from external noise and
lightning strikes. A permanent connection must be made between earth and the earth terminal
of the main unit.
1. Loosen the screw.
2. Insert an earthing wire (user-supplied)*.
3. Tighten the screw.
4. Connect the earthing wire to earth.
*
Use an earthing wire that has a conductor with a cross-sectional area of at least 0.75 mm
2
or 18
AWG. Green-and-yellow insulation is required.
Screw
To earth
Earthing wire