Answer Posted / m.v.ramesh

There are several differences between Control cables and
signal cables...
1. Physical Construction wise, 2. Purpose and usage, 3.
Applications etc.


Above all answers are mostly right but something to be
added. The basic is nature of cable.

Both the cables carries Current and Voltages at different
levels.

Signal can be voltage mesured or current measured, 0-5
volts, 1-5 volts, 0-10 volts, 0-50 volts, milli vlolts T/C,
resistance (RTD) etc (with a current carrier say few mill
ams to amps), 4-20 ma (with volage carriers), freequency
dominated (Pick ups) with both current and voltage
carriers. Ie, to note one of this components is fixed and
others will vary acc to the change in the measured
parameter or demand parameter.

Control cables are mostly Voltage driven with current
carries (usually several amps)and fixed freequencies (24v,
110, Ac, DC). Ther will be no change usually either in
voltage, current & freequency. exept zero level to rated
level. like on-off conrtol vales positions. But not 3 phase
and 440 volts are control cables they come in power cables
& high voltage categories.

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