DoorBird A1101 Manuel D'installation page 10

The wire diameter is the inner metal core
only, not the inner metal core plus the
jacket.
Often more than two wires are available
on-site for the connection of an indoor station.
The maximum current can be doubled to
increase the maximum number of installable
devices by using two wires for one core. In
this case, the two wires must be twisted at
both ends. The applied voltage must not
exceed 48 VDC.
If shielded cables are used, the shielding should be
connected to each other.
INFORMATION FOR PLANNERS OF
NEW BUILDINGS
If you know how many devices must be installed and
you know the length of the cables, you can check
the following chart to see which wire diameter is
required.
The following scenario is calculated and
visualized in a chart under the worst-case
scenario that all devices are connected to
the rearmost end of cable in the building. In
practice, the devices are distributed more or
less evenly over the cable length / floors.
40
35
30
25
20
15
10
5
in meter 20 40
in feet 65 131 196 262 328
10
Wire diameter:
0,8 mm
0.031 in
0,6 mm
0.024 in
0,5 mm
0.019 in
60 80 100 120 140 160
393 459 524
Cable length
INFORMATION FOR PLANNERS OF
EXISTING BUILDINGS
The length of the cables in existing buildings is often
unknown and can only be roughly estimated. The
diameter of the wires and the loop resistance (ohm)
are known or at least easy measurable. This makes
it possible to determine the maximum number of
devices that can be connected to a single wire pair.
The following scenario is calculated and
visualized in a chart under the worst-case
scenario that all devices are connected to
the rearmost end of cable in the building. In
practice, the devices are distributed more or
less evenly over the cable length / floors.
40
35
30
25
20
15
10
5
0
5
Loop resistance (Ohm)
The loop resistance can easily be measured
by switching off the power supply on the
wires to be measured and applying a
short-circuit to the lines to be measured on
one side and measuring the resistance on
the other side of the wires with
a multimeter.
ASSEMBLE THE MOUNTING
7
BRACKET
Lead all cables and wires you want to connect to
the device through the mounting bracket. Screw the
mounting bracket to the wall.
Wire diameter:
0,8 mm
0.031 in
0,6 mm
0.024 in
0,5 mm
0.019 in
10 15 20 25