Bosch B5512 Reference Manual page 87

Control Panel
Maximum cable lengths
Follow these rules when wiring the SDI2 bus:
–
–
–
Cable Overall
capacitance cable
length
pF/ft ft
< 17 7500
18 7500
19 7350
20 7000
21 6666
Table 17.1: 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.
Example cable types
AWG MFG/PN
22 Belden
5541
Belden
1242
Belden
5502
Belden
5522
18 Belden
5302
Belden
1242
Bosch Security Systems, Inc.
The SDI2 bus requires the use of un-shielded cable from 12 AWG to 22 AWG.
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:
Cable Overall
capacitance cable
length
pF/ft ft
22 6363
23 6086
24 5800
25 5600
26 5385
Capacitance Resistance
pF/ft Ω/1000 ft
18 16.3
15 17.6
20 16.2
19 15.7
22 6.5
15 17.6
Installation and System Reference Guide
Cable Overall
capacitance cable
length
pF/ft ft
27 5185
28 5000
29 4828
30 4700
31 4516
Max Run NEC Type
7500 CL3P, CL3R,
CL3, CL3X,
CL2P, CL2,
CL2R, CL2X,
CM
7500
7000
7350
6363
7500
System wiring diagrams | en
Cable Overall
capacitance cable
length
pF/ft ft
32 4400
33 4242
34 4100
35 4000
36 3800
Definition
Class 2 and Class 3
remote control,
communications,
signaling and power
limited cables
2015.07 | 12 | F.01U.287.180
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