Wire Sizes

The wire sizes pane provides information for the wire types available with Revit. The right pane lists wire types, based on material, temperature ratings (60 degrees C, 75 degrees C, and 90 degrees C) and insulation type. Correction Factor and Ground Conductor branches list correction factors (based on ambient temperature), and ampacity for ground conductor sizes.

The wire size table lists the wires sizes currently available for a given combination of wire material, temperature rating, and insulation type. Each combination of material, temperature rating, and insulation type is associated with a separate table of wire sizes. Whenever a new attribute (material, temperature rating, or insulation type) is created, a new table of sizes is also created for the attribute. Each size shows ampacity, AWG (American Wire Gauge) size, and diameter of wires available in a project. Revit calculates the wire size for circuits (based on the current rating of the circuit) to maintain a voltage drop of less than 3 percent.

• Material: (default values are Aluminum and Copper)

  Click Delete to remove a selected material from the table. A material cannot be deleted if it is in use in a project or if it is the only one specified in a project.

  Click Add to open the New Material dialog, where you specify values for a new wire material. Material names must be unique with a project.

• Temperature: The temperature (Celsius) determines which insulation types are available for a particular material. There is a greater selection of insulation types available for lower temperatures than for high temperatures. For example, type UF insulation is available for Aluminum wire at 60C, but when you select 90C for Aluminum wire, type UF insulation is not available.

  Click Delete to remove a setting. A temperature cannot be deleted if it is in use in a project or if it is the only one specified in a project.

  Click Add to open the New Temperature dialog where you specify values for a new temperature. Temperature names must be unique for a specified material.

• Insulation: The default insulation values depend on the selected material and temperature.

  Click Delete to remove a setting. An insulation type cannot be deleted if it is in use in a project or if it is the only one specified in a project.

  Click Add to open the New Insulation dialog where you specify values for a new wire insulation type. Insulation type names must be unique for a specified material.

• Used by Sizing:

  When selected for a specific wire size, that wire size is made available for use in circuits where Revit calculates the wire size. When cleared, the size is not available for use with the sizing feature.

New Ampacity Dialog

Use this dialog to specify a new ampacity (wire size) to add to the currently selected wire sizes table.

1. Specify the ampacity, wire size (AWG), and diameter for the new wire.
2. Click OK.

   The ampacity is added to the table.

New Material Dialog

Use this dialog to add a new wire material based on an existing material, and create an associated table. The new table contains the same wire sizes as those listed in the table associated with the original material.

1. Enter a name for the new material.

   The material name must be unique within a project.

2. Select a Material Based on.
3. Click OK.

New Temperature Dialog

Use this dialog to add a new temperature rating based on an existing temperature, and creates an associated table. The new table contains the same wire sizes as those listed in the table associated with the original temperature.

1. Enter a name for the new temperature.

   The temperature name can be any unique string.

2. Select a Temperature Based on.
3. Click OK.

New Insulation Type Dialog

Use this dialog to add a new insulation type for the currently selected material and temperature, based on an existing insulation type.

1. Enter a name for the new insulation type.

   The insulation type name can be any unique string.

2. Select an Insulation Based on.
3. Click OK.