Circuit to Phase

This section describes the Circuit to Phase button on the Circuiting dialog box. The Circuit to Phase button connects devices on the drawing to a specific phase of a circuit on a one-line device. There are two common uses for this button:

Shared Neutrals on Multiwire Branch Circuits: NEC 2008 210.4b requires multiwire branch circuits that share a neutral to have the breakers all trip at the same time. Using this button, you can connect single-pole devices to a specific phase of a two-pole or three-pole circuit. All of the devices on the circuit will share a common neutral and have a common trip.
208 and 480 Volt Site Lighting on Three-Phase Circuits: It is common to connect two pole site lights to three pole circuits, rotating the phases that are connected to keep the load balanced. Using this button, you can connect two-pole light fixtures to a specific phase of a three-pole circuit.

When the button is pressed, the Circuiting dialog box is closed. The circuit that was selected in the Circuit List starts as the current circuit. The current circuit can be changed during the command using the Increment circuit option.

The Select Circuit Phase dialog box will appear. You are prompted to select the phase of the circuit to connect the devices to.

Circuiting and Homeruns--Select Circuit Phase dialog box

After you select the phase, you are prompted to select the devices to be circuited. The current circuit, the load connected to the circuit, the size of the breaker on the circuit, and the starting phase of the circuit are all listed on the command line.

Select devices to be circuited:
Current Circuit: <Circuit> Connected KVA: <Load> Breaker Amps: <Breaker Size> Phase: <Phase Letter>
Press ENTER for circuiting options, twice to return to circuiting dialog.

Select device: Select the devices to be connected to the selected phase on the current circuit. The devices will be connected if the voltage matches the circuit.

A circuit label listing the panel and circuit number will be inserted next to the selected devices. The circuit label will be updated or removed when the homeruns and loops are drawn for the circuit.

If you select a device with multiple loads, you will be prompted to specify which loads you want to connect to the selected phase on the current circuit.

If the circuit is a space and the device has more poles than the circuit, the circuits below the current circuit are checked. If the circuits below are spaces, the spaces are joined together to make a circuit large enough for the device, and the device is connected to the new circuit. If the circuits below are not spaces, they cannot be joined with the current circuit. The device will not be connected to the current circuit.

If the device has fewer poles than the circuit, the device is connected to the selected phase on the current circuit. The number of poles on the circuit is not changed.

Circuiting options: When you press enter, you will be prompted to change the phase or circuit that is current.

[Set phase/Increment circuit/<Return to circuiting dialog>]

Set phase: Select a new phase to connect to using the Select Circuit Phase dialog box, shown above.

Increment circuit: Increment the current circuit to the next circuit. On panels, the next circuit will be on the same side of the panel as the current circuit. The increment function will not move you between the odd and even sides of the panel.

Return to circuiting dialog: Press enter a second time to be returned to the Circuiting dialog box.


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