5.7 Determination of Correct Control Circuit Wire Gauge
International Standards define the limiting factors that must be applied to wiring connections in this type of
equipment. In general, any wiring that has voltage on it which is greater than 30 VAC or 42.2 VDC is required to
comply with the recommendations below.
The cabling used must be suitable for the rated load imposed by the device being controlled. Where the voltage
exceeds that mentioned above of 30 VAC or 42.2 VDC, the wire should not be less than 24 AWG or 0.2 mm
2
in
order to comply with International Electrical Safety Standards.
Rules defining wire gauge are many and depend on factors such as temperature, wire bundling, number of loaded
wire pairs, duty cycle of output function, etc.
In order to simplify the process, the following sections provide a guide to the wire size that should be used to
ensure compliance with the necessary regulatory standards in the EU and NA.
Note: Use the wire size or larger for the required current load; note that the values shown in
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