When feeder IDs are generated, you can set the naming conventions for the IDs in the Options command in Design Master Electrical for AutoCAD, and the Project Options command in Design Master Electrical RT for Revit.

In the One-Line Diagram/Feeder ID section, find the Feeder ID format/Format option and set the format you want to use.

If you need to change the feeder ID format after starting a project, see Changing Feeder ID Formats.

There are three additional options related to feeder IDs:

• Automatically create feeder IDs: Sets whether feeder IDs are automatically generated based upon the selected Feeder ID format. If this is set to No, you will be prompted to define each feeder ID as it is generated. This is useful if you want to create custom feeder IDs; otherwise, set it to Yes.
• Copy feeder IDs to master schedule when created / Transfer feeder IDs from master schedule if possible: These options help ensure consistent feeder IDs across projects. When both options are enabled, feeder IDs will be pulled from the master schedule if they exist for the feeder types in the project; if a feeder ID does not exist, it will be generated and copied to the master schedule for future projects.
  • (Electrical only) If Feeder ID format is set to Sequential, these options are disabled.

Short

The Short format uses a compact format that is also descriptive of the feeder.

If you combine the wire count for neutral and hot wires, this format lists the ampacity of the feeder and the number of wires. Feeders with an equipment ground (NEC 250.122) do not have any additional information.  Other feeders will have the following letters added to the end of the ID:

• J: Service ground (NEC 250.102)
• U: No ground
• I: Isolated ground

If you separate the wire count for neutral and hot wires, this format lists the ampacity of the feeder. The number of hot wires is listed if it is 1 or 2. Feeders with a neutral and an equipment ground (NEC 250.122) do not have any additional information. Other feeders will have the following letters added to the end of the ID:

• NN: Two neutrals
• D: No neutral
• J: Service ground (NEC 250.102)
• U: No ground
• I: Isolated ground

If two feeders use the same ID but are different (e.g., same ampacity and wire count but different material or conduit size), “.A” will be added to the end of the second ID. Subsequent IDs will have “.B”, “.C”, etc.

Long

The Long format uses a more descriptive format for the feeder ID that is meant to be easily understood without referring to the feeder schedule.

First, the feeders are labeled with the ampacity of the feeder.

Next, the number of wires in the feeder is listed. If you combine the wire count for neutral and hot wires, this format lists the combined neutral plus hot wire count. If you do not combine the wire count for neutral and hot wires, this format lists the hot wire count, then one of the following neutral designations:

• N: One neutral
• NN: Two neutrals
• D: No neutral

Finally, if there is a ground, one of the following designations is added:

• G: Equipment ground (NEC 250.122)
• J: Service ground (NEC 250.102)
• IG: Isolated ground

If two feeders use the same ID but are different (e.g., same ampacity and wire count but different material or conduit size), “-A” will be added to the end of the second ID. Subsequent IDs will have “-B”, “-C”, etc.

Size + letter (Electrical for AutoCAD Only)

The Size + letter format use lists the ampacity and a single letter. The letter after the ampacity is consistent based upon the type of feeder but is not intended to be descriptive by itself.

If you combine the wire count for neutral and hot wires, the following letters are used:

• A: 2 wires, no ground
• B: 2 wires, ground
• C: 3 wires, no ground
• D: 3 wires, ground
• E: 4 wires, no ground
• F: 4 wires, ground
• G+: Other configurations as they come up in a project.

If you do not combine the wire count for neutral and hot wires, the following letters are used:

• A: 1 hot wire, neutral, no ground
• B: 1 hot wire, neutral, ground
• C: 2 hot wires, no neutral, no ground
• D: 2 hot wires, no neutral, ground
• E: 2 hot wires, neutral, no ground
• F: 2 hot wires, neutral, ground
• G: 3 hot wires, no neutral, no ground
• H: 3 hot wires, no neutral, ground
• I: 3 hot wires, neutral, no ground
• J: 3 hot wires, neutral, ground
• K+: Other configurations as they come up in a project.

Sequential (Electrical for AutoCAD Only)

The Sequential format uses a number for the ID. The IDs are generally ordered based upon the ampacity of the feeder. After the initial feeders are ordered, any new feeders are added to the end of the list. The IDs are stable during the project, but the list can end up with odd ordering depending upon how feeders are added to the project.

See Working with Sequential Feeder IDs for the recommended workflow when using this format.