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One-Line Diagrams: Automatic Generation and Customization Options

Monday, November 30th, 2015

<– Return to main How to Use One-Line Diagrams article.

Want help customizing your one-line diagram? Send a sample one-line in PDF or DWG format to support@designmaster.biz. We are happy to assist you with getting your graphics looking correct.

There are two different commands that will automatically insert a first draft of your one-line diagram for you. One or the other should roughly match the way you currently draw your one-line.

The Generate One-Line command inserts your distribution equipment from the top of your page down.

The Generate Riser command inserts your distribution equipment from left to right. The elevation of the distribution equipment in your model is used to arrange everything vertically on the page.

For both of these commands, they insert a specific piece of distribution equipment and everything connected to it. You can select the first piece of equipment that is connected to the utility to generate your whole one-line. You can select something further down the tree to generate part of your one-line.

We recommend first generating the whole one-line. If the layout is close to what you want, start moving and adjust equipment to make it look right.

If the layout is not close, erase the whole thing, then insert separate pieces of the one-line. After you have inserted smaller sections, you can then generate from the first piece of equipment. All the equipment you already inserted will stay where it is and only missing equipment will be added. This process should connect all the different sections together.

As you make changes, you can run the generate commands again to add missing distribution equipment. Anything that is already inserted will not be modified. Only missing equipment will be added.

Here are some of the options you should try changing to get the generated one-line to match your current standards. All of these options are in the DM Electrical->Customization->Options command in the One-Line Diagram section.

Generate One-Line Options

Layout of Bus Bar Horizontal Panels: There are two ways that the horizontal panels that feed multiple downstream panels can be arranged. The whole bus can be horizontal, with the main breaker graphic on the horizontal bus. Or there can be vertical section of the bus with the main breaker on it connected to a horizontal bus.

Use the Include vertical main breaker on horizontal panels option to change between these two display options.

No Bus Bar on One-Line: If you do not want to display a bus bar on your panel, change the following options.

Set Include breaker graphics on feeder wires to No.

Set the default blocks to <Custom Panel Box>. You can either use the Default riser blocks to make this change for the Generate Riser and Generate One-Line command, or you can use the Default one-line blocks to make the change for just the Generate One-Line command. If you use the one-line block options, you need to make the change in two places, Default one-line blocks (multiple downstream panels) and Default one-line blocks (0 or 1 downstream panels).

Size and Spacing of Panel Boxes: If the graphics are not the right size, use the Default panel box height and Default panel box width commands to change them. These sizes are multiplied by the current drawings DIMSCALE value when the panels are inserted. The units should be equal to “inches on the printed page”, but that might vary depending upon how your drawings are set up. A space equal to the height option is used between each row of the one-line. A space equal to the width option is used between each piece of distribution equipment within a row.

Generate Riser Options

No Bus Bar on Riser: If you do not want to display a bus bar on your panel, change the following options.

Set Include breaker graphics on feeder wires to No.

Set the Default Riser Blocks to <Custom Panel Box>. With the default customization, this will change the blocks used for the Generate One-Line command, too. If you want to use different blocks for that command, make sure the change the Default one-line blocks from <Same as Riser Block> to a different value.

How Feeders Connect to Panels: There are a number of options that control how feeders connect to panels.

The incoming feeders can connect to the top or the bottom of the panel using the Default fed from (in automatic riser) option. Panels initially use this value to control how they are connected. It can be changed for each individual panel in the DM Electrical->Distribution Equipment->Panels command. Press the Block Settings button and change the Initial Fed From (in Automatic Riser) field.

If panels have a bus, outgoing feeders are always connected perpendicular to the bus bar. The height of the panel will be increased if the feeders extend past the bottom of the panel.

If panels do not have a bus, the outgoing feeders can connect to either the side  or the top and bottom of the panel graphic using the Default feeder connection layout option. If the Side option is used, the height of the panel will be increased if the feeders extend past the bottom of the panel. If the Top and bottom option is used, the spacing between feeders will be reducedif necessary so that they all fit on the panel without changing its size.

Size of Panel Boxes: If the graphics are not the right size, use the Default panel box height and Default panel box width commands to change them. These sizes are multiplied by the current drawings DIMSCALE value when the panels are inserted. The units should be equal to “inches on the printed page”, but that might vary depending upon how your drawings are set up.

Spacing of Distribution Equipment: Distribution equipment at the same elevation uses the Default panel box width option to arrange the equipment horizontal.

Distribution equipment at different elevation uses the Riser height multiplier option to control how far apart the equipment is inserted. This value does not correspond to any specific units. If the vertical spacing of equipment is not right, adjust the value, erase the equipment that was inserted on the drawing, then run the Generate Riser command again. Repeat this process until the vertical spacing looks right.

Spacing of Feeders: Use the Feeder offset multiplier option to change how far apart feeders are inserted from each other. The units should be equal to “inches on the printed page”. They will match the units used for your text height size. The default text height is 0.1 and the default feeder offset is 0.3, so the feeders will be three times as far apart from each other as text is tall on the drawing.

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