User's Manual

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12/99 User Manual Bedas 93 20 17
2.1 Power Supply
Before any device is connected to the supply voltage, it must be checked if
the line voltage is corresponding with the devices requirements. See type
label of the device.
Devices which are dedicated for installation in dry rooms, e.g. offices, are not
allowed to be installed outdoors or in rooms where splashing water might
occur. Devices which are installed in such areas are
not allowed
to be con-
nected at 230V but must be supplied with 24V voltage.
Model Bedas 93 20 shall be installed on the load side of a class2 or class3
power source as defined by the National Electric Code (NEC), article 725-2.
For proper wiring methods, refer to NEC articles 725-52,-54,-61 and 71.
For reducing of electromagnetical interferences the cable type between po-
wer supply and device must absolutely be shielded. The shielding must be
connected on both sides to protective earth. In the terminal protective earth is
realized via the cable clamp. Additionally the cable must be lead-in the ferrite
which is deliverd with the device.
The ferrite must be installed as near as possible to the device!