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86
Cables
12.1.1
How to Calculate the Maximum Recommended Length
For cables not in Table 23, you can determine the maximum length of cable between
transponders using the cable’s mutual capacitance, which is provided by the cable
manufacturer.
Capacitance
Capacitance is the ability of a system to store an electric charge when a potential difference
exists between its conductors. Capacitance is measured in farads (F). A system that is
charged with 1 coulomb of energy and that has a potential difference of 1 volt between its
conductors has a capacitance of 1 farad.
Draka Lifeline
FAS-2C/16NS
16 AWG, 2 conductors,
twisted, non-shielded
625
2050
Draka Lifeline
FAS-2C/16OS
16 AWG, 2 conductors,
twisted, shielded
360
1180
Electro Cables
7241802BFT4
18 AWG, 2 conductors,
twisted, shielded
190
620
Electro Cables
7241803BFT4
18 AWG, 3 conductors,
twisted, shielded
195
640
Honeywell Genesis
Series
4106
18 AWG, 2 conductors,
non-shielded
535
1750
Honeywell Genesis
Series
4602
18 AWG, 2 conductors,
shielded
160
515
Pentair Pyrotenax
2/18-215T
18 AWG, 2 conductors,
twisted, non-shielded
225
745
Provo Ltd.
PP5052-21
18 AWG, 2 conductors,
twisted, non-shielded
600
1970
Provo Ltd.
PP5883-21
18 AWG, 2 conductors,
twisted, shielded
180
590
West Penn Wire
980
18 AWG, 2 conductors,
twisted, non-shielded
460
1520
West Penn Wire
990
16 AWG, 2 conductors,
twisted, son-shielded
460
1520
West Penn Wire
975
18 AWG, 2 conductors,
twisted, shielded
265
875
West Penn Wire
991
16 AWG, 2 conductors,
twisted, shielded
230
760
Table 23 Maximum Recommended Cable Lengths (Continued)
Manufacturer
Model
Type
Recommended
maximum length per
cable segment (point-to-
point)
Metres
Feet