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Distance limitation for control cables

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.

Brad Waybright

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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