4.
Connect the earthing wire to earth.
A
B
(1)
(1) To earth
A
Screw
B
Earthing wire
WARNING
•
Proper earthing (connection to earth) is very important to reduce the risk to the user of electrocu-
tion or to protect the PBX from the bad effects of external noise 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 and to ensure electromagnetic compatibility. A permanent
connection between earth and the earth terminal of the PBX must be made.
CAUTION
For earthing wire, green-and-yellow insulation is required, and the cross-sectional area of the con-
ductor must be more than 0.75 mm
2
or 18 AWG.
Note
Be sure to comply with applicable local regulations (e.g., laws, guidelines).
3.2.5 Installing/Removing the Optional Service Cards
CAUTION
•
Before touching the product (PBX, cards, etc.), discharge static electricity by touching ground or
wearing an earthing strap. Failure to do so may cause the PBX to malfunction due to static electrici-
ty.
•
When installing or removing the optional service cards, the power switch must be turned off, and the
AC power cord must be removed from the AC inlet.
•
When installing or removing the optional service cards, do not put pressure on any parts of the
mother board. Doing so may result in damage to the PBX.
•
Disconnect the AC power source before servicing the equipment.
Notice
Make sure the AC power cord is not connected to the AC inlet of the PBX.
3.2.5 Installing/Removing the Optional Service Cards
45
