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# Distance limitation for control cables

## Distance limitation for control cables

(OP)
Ca we use cu 5CX2.5 mm2 control cable for Local Push Button Station at a distance of 480 Meter from Motor Control Centre . Control Supply voltage is 110VAC.

### RE: Distance limitation for control cables

That depends entirely on the circuit current load. Grounding requirements also apply.

The more you know, the more you know you don't know.

### RE: Distance limitation for control cables

Spoiler alert - if you read the threads Keith references, I suspect you'll find that 110 V ac pilot control at that distance will be problematic, regardless of wire size. DC control can work.

### RE: Distance limitation for control cables

Or, you have to put a shunt load on the cable to waste the coupled energy.

Keith Cress
kcress - http://www.flaminsystems.com

### RE: Distance limitation for control cables

Dear Mr. SYAMAL KUMAR SARBADHIKARI (Electrical)
" Can we use cu 5CX2.5 mm2 control cable for Local Push Button Station at a distance of 480 Meter from Motor Control Centre . Control Supply voltage is 110VAC."
1. Your question is on the [influence of the length of conductors used in contactor control circuit]. Under certain conditions the excessive length of the control circuit conductors may prevent the contactor from:
a) not closing: due to excessive voltage drop (in ac or dc),
b) not opening: due to excessive capacitance (in ac).
2. Influencing factors:
a) voltage, conductor size, length and the [pull-in VA of the contactor],
b) the wiring (e.g. via maintained push-button or via momentary push-button...). These may be caused by i) high control voltage, ii) low coil holding consumption, iii) low contactor dropout voltage, [the line capacitance etc....].
3. These information are published in the "contactor " catalogues of major contactor manufacturer, based on their own product.
4. Your data did not specified the [contactor(s) pull-in and holding VA].
Che Kuan Yau (Singapore)

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