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3.2 Installation of the PBX
56 Installation Manual
3.2.5 Frame Earth Connection
IMPORTANT
Connect the frame of the PBX to earth.
• Be sure to comply with applicable local regulations (e.g., laws, guidelines).
• Proper earthing (connection to earth) is very important to protect the PBX from the bad effects of
external noise or to reduce the risk to the user of electrocution in the case of a lightning strike.
• The earthing wire of the AC cable has an effect against external noise and lightning strikes, but it may
not be enough to protect the PBX. A permanent connection between earth and the earth terminal of
the PBX must be made.
1. Loosen the screw.
2. Insert an earthing wire (user-
supplied)*.
3. Tighten the screw.
4. Connect the earthing wire to
earth.
* For earthing wire, green-and-yellow insulation is required, and the cross-sectional area of the conductor
must be more than 0.75 mm
2
or 18 AWG.
To earth
Earthing
wire
Screw