Circuits, Load Types, and Wire Sizes

This section describes the options available in the Circuits, Load Types, and Wire Sizes group in the Design Master Electrical Options dialog box.

Customization--Options.Edit Project List.Circuits Load Types Wire Sizes

Unused circuit description: Specifies how circuits that do not have any devices connected to them are labeled in the panel schedule.

Space with breaker size listed: The circuit description is set to SPACE. The breaker size is displayed as the smallest default breaker.
Space with no breaker listed: The circuit description is set to SPACE. The breaker size is displayed as a dash.
Spare with breaker size listed: The circuit description is set to SPARE. The breaker size is displayed as the smallest default breaker.
Spare with no breaker listed: The circuit description is set to SPARE. The breaker size is displayed as a dash.

Use the DM Electrical->One-Line Schedules->Update One-Line Device Schedule command to update schedules after changing the option.

Default circuit layer system: The default layer system associated with circuits and taps on panels.

Same as One-Line Device: The circuits will be the same layer system as the one-line device that are associated with.
<Layer System>: The circuits will be the specific layer system chosen.

This default setting can be overridden for specific circuits using the Circuiting dialog box. See the Circuiting section for more information on setting the layer system for circuits.

Receptacle circuit count limit: This setting is used to alert you when a certain number of receptacles have been placed on a single circuit. This alert happens while circuiting the receptacles. Once the receptacles are circuited, this warning will not be shown.

The count is based upon total load, not the number of devices. Every 0.18 kVA of load is counted as a receptacle. This way, a quad receptacle with 0.36 kVA that is inserted as a single receptacle is counted as two receptacles as not one.

The warning does not prevent you from connecting more receptacles to the circuit than specified for situations where that is necessary.

Circuit amp limit: This setting is used to alert you when the load on a circuit has reached a certain number of amps. This alert happens while circuiting devices. Once the devices are circuited, this warning will not be shown.

The warning does not prevent you from connecting more devices to the circuit than specified for situations where that is necessary.

Include room names in circuit descriptions: Whether room names are includes in circuit descriptions on panel schedules. If one of the yes options is selected, all of the rooms that any of the devices on the circuit are in are listed in the description. These rooms must be inserted using the Create Room command.

Yes, include "Room" in description: The rooms are listed in the circuit description. The word "Room" and the room name is included in the description.
Yes, do not include "Room" in description: The rooms are listed in the circuit description. Only the room name is included in the description.
No: The rooms are not listed in the circuit description.

Size breakers to 100% of noncontinuous load: Specifies whether you size branch circuits to 100% of noncontinuous loads (per NEC 210.20(A)) or to 125% of noncontinuous loads.

Yes: Branch circuits are sized to 100% of noncontinuous loads and 125% of continuous loads. This setting gives you smaller breakers and wire sizes.
No: Branch circuits are sized to 125% of all loads. This setting gives you larger breakers and wire sizes.

Continuous load types are lighting, motor (NEC 430.24), continuous, and heating (NEC 424.3B).

Noncontinuous load types are noncontinuous, receptacle (NEC Handbook Exhibit 220.4), kitchen, and diverse.

All motors are considered continuous at the branch circuit level.NEC 424.19 allows you to treat the largest as continuous and the rest as noncontinuous. If that is required for your design, you will need to manually downsize the motor breaker and wires.

Custom Load Type 1 and Custom Load Type 2: You can create two custom load types. The load types can be used on your projects for load types that are not included with the software. The settings for the two custom load types are the same.

Name: The name of the custom load type. It is displayed when selecting the load type of a device and it is printed on the one-line device schedule load summary.

Calculation method: The method used for setting the demand factor for the load type.

Fixed demand factor: The demand factor for the load is constant and fixed. (Most of the default load types are fixed.)
Variable demand factor: The demand factor varies depending upon the load. (For example: kitchen and diverse load dtypes)
Variable calculated load: The demand factor varies, but the calculated load is input, rather than the demand factor.

Load type: Whether the load type should be treated as a Continuous or Noncontinuous load for branch circuit sizing.

Wire Sizing Option: Which sizing option is selected in the Wire Sizing dialog box. See the Wire Sizing section for more information on creating custom wire sizing tables. This option is most useful in the Standards database to set the default sizing option for new projects.

Show #10 when wires upsized: Branch circuits that are sized to #12 wire are automatically upsized if they exceed a certain length. This option controls whether a #10 is displayed next to these homeruns on the drawing.

Upsize #12 to #10 wire length: Branch circuits that are sized to #12 and exceed this length are automatically upsized to #10 wire.


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