When connecting a power cable to a circuit symbol, the software shows the available connection points. Make sure that you connect to the circuit symbol power connect points according to the following rules:
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Connecting to an incomer circuit — connect the cable on its Side 2 (the To side) to Side 1 of the incomer.
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Connecting to a feeder or coupler circuit — connect the cable on its Side 1 (the From side) to Side 2 of the feeder or coupler.
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Connecting to a bus riser — connect the cable on its Side 2 (the To side) to Side 1 of the bus riser. Note that the cable must be connected to a coupler on its From side prior to connecting the bus riser.
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Connecting to a panel circuit — you can connect to either side of the panel circuit. If you connect to Side 1 of the panel circuit, connect the cable on its Side 2 (the To side). If you connect to Side 2 of the panel circuit, connect the cable on its Side 1 (the From side).
When connecting a control, instrumentation, or grounding cable to a circuit symbol, it is only possible to connect to non-power connect points of the circuit symbol. In this case, the software shows both connection sides of the circuit symbol and you can connect to either side of the circuit as you require.
Note that the same rules also apply when making connections in the Electrical Engineer or the Cable Common Properties dialog.