Voltage drop for 24 VDC Estop circuit

I

Isaiah

Senior Member
Location
Baton Rouge
Occupation
Electrical Inspector
I’ve got an ESTOP circuit that runs about 1400 feet total and has three locations along its path - all switches are in series.
The switches are fed off an Allen Bradley 440R relay. I’m assuming since this is a simple open/close scenario there is little (or no) amp draw and voltage calc should be determined by cable resistance only - in this case pair #16AWG. Am I on the right track?


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If these are going to a monitored estop relay, it uses pulses of 24 vdc to make sure there are no cross channel shorts.

Fourteen hundred feet is a long way to run wires with square wave pulses in them.
 
petersonra said:
If these are going to a monitored estop relay, it uses pulses of 24 vdc to make sure there are no cross channel shorts.

Fourteen hundred feet is a long way to run wires with square wave pulses in them.
Click to expand...

Thanks petersonra. Would you happen to have a sample calculation assuming these are monitored?


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