Smart Electrical allows you to specify two power sources for equipment: a primary source and an alternative source.
The following item types can have a dual source power supply:
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All loads (for example, a motor fed by supplies on two separate buses).
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All converting equipment items (for example, a variable-frequency drive fed by the two secondaries of a 3-winding transformer or an uninterruptible power supply fed by a main input with battery back-up).
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All instruments and cabinets.
You can drag one of these items in the Electrical Engineer to any item that can have a single-source power supply.
To set up a dual power supply, you first create each of the feeder branches and associate the main supply with the item. Next, you specify the second feeder branch as the alternative power supply. The software can display dual power supplies in single line diagrams.
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Loads that are connected to circuits for which the circuit mode value is Disconnected appear in bus load summaries, but the software does not take those loads into account in the total load calculation.
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If a load is connected to a dual power source that originates from the same feeding upstream bus, the software does not count such a load twice and accounts for it correctly in load summaries and other load calculations.
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For batch load association calculations, a load connected to a circuit in Disconnected mode is only displayed in the Associated loads data window of the Bus Load Association dialog. Such a load does not appear in the Calculation results group box. There is no need to set the circuit mode as Connected or Disconnected for loads that have an alternative power source. The software automatically sets the circuit mode of these loads to Disconnected.