Bosch B6512 Installation Manual page 31

Control panels
Notice!
There can only be a difference of 2 volts (maximum) between the AUX power terminals of the
control panel or power supply and the device for the modules and keypads to work properly
under all conditions.
Maximum cable lengths
Follow these rules when wiring the SDI2 bus:
–
–
–
Cable capacitance
pF/ft
< 17
18
19
20
21
22
23
24
25
26
Table 7.1: Maximum cable length
Notice!
Use unshielded cable only.
Maximum capacitance of 140nF (140,000 pF) per system. Contact the wire manufacturer for
the capacitance ratings of the wire being used.
Bosch Security Systems B.V.
The SDI2 bus requires the use of unshielded cable from 12 AWG to 22 AWG (0.65 mm to
2 mm).
Refer to the SDI2 device or keypad documentation for the allowable maximum distance
from the control panel.
Maximum overall cable lengths are listed in the following table:
Overall cable length
ft m
7500 2286
7500 2286
7350 2240
7000 2134
6666 2032
6363 1939
6086 1855
5800 1768
5600 1707
5385 1641
Cable capacitance
pF/ft
27
28
29
30
31
32
33
34
35
36
UL Installation manual
System wiring diagrams | en
Overall cable length
ft m
5185 1580
5000 1524
4828 1472
4700 1433
4516 1376
4400 1341
4242 1293
4100 1250
4000 1219
3800 1158
2019-12 | 10 | F.01U.287.185
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