Comic mockup of load feeder configurator in the Tia Selection Tool

Control panel tip

Load feeder design made easy: Cable dimensioning and short-circuit calculation.
Control Panel Design Software in the Offline Version of the TIA Selection Tool

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Are you looking for an easy dimensioning of load-feeders? Choose the right, standard-compliant components according to IEC or UL with the optimal cable cross-section and short-circuit calculation. You can get this in a structured visualization.


The safe switching of three-phase asynchronous motors for machines not only requires the selection of the correct switching devices. The cable to the load also has to be adapted to the ambient conditions to carry the current safely in all situations. Some calculations are required to find the suitable cable cross-section and ensure it is the right one.

The switching and protection devices required to operate the motor dependent on the mechanical load and until now had to be determined with reference to the SIRIUS Configuration Manual or by searching the catalog. This was followed by a search for suitable variants with the correct control voltage and type of connection, and the necessary auxiliary contacts.


This is now easier, because with the Control Panel Design functionality in the TIA Selection Tool, you can quickly and reliably find the right switching and protection devices for your motor – including suitable accessories.

Until now, you made ensured this by selecting the right device combinations as usual using product catalogs, manuals, certificates and standard requirements.


If you use our Control Panel Design software to determine the components, you can be sure that they are dimensioned according to the applicable standards (UL508A, NFPA79, IEC 60204-1).


It includes all the important requirements of the IEC and US standards areas that are relevant for dimensioning the electrical components of a machine. (Including the appropriate wire sizes for UL and IEC, as well as the relevant short-circuit values in the circuit).

Many constraints have to be taken into account when determining the cable cross-section. These include the ambient temperatures, method of installation and number of loaded circuits or cables. The cable also has to carry the current safely under overload and short-circuit conditions. Furthermore, the voltage drop must not be too large and the minimum short-circuit current not too small so that the motor can be safely switched and also safely shut down in the event of a malfunction.

Finally, the standard IEC 60204-1 specifies the minimum requirements for electrical safety for the protection of the machine, drives, and operator. However, additional standards such as IEC 60364, IEC 61439, IEC 60909 (short-circuit calculations) or VDE 0100 also have to be consulted frequently.


For the US market, the rules for determining the conductor cross-sections are set down in UL 508A, NFPA79 and the NEC.


The Control Panel Design in the TIA Selection Tool determines the appropriate cable cross-section inside and outside the control cabinet at the push of a button – and everything according to the required standards. Parameters such as the cable installation method or ambient temperatures can be selected freely to dimension the cable as optimally as possible for the prevailing conditions.

Yes, as part of the risk assessment of electrical equipment for machines, IEC 60204-1 also makes short-circuit consideration mandatory. There are no special normative requirements for the US market.


By the way: Control Panel Design in the TIA Selection Tool automatically determines the relevant short-circuit values.

Control Panel Design in the Offline Version of the TIA Selection Tool

Free download

You can find Control Panel Design in the Offline Version of the TIA Selection Tool. Download the TIA Selection Tool for this here.

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