Design Master allows you to create transformers independently from a panel. Once a transformer is created, it may serve a single panel or multiple panels.
To create a transformer, go to
DM Electrical
One Line DevicesTransformers
A Transformer dialog box will appear. To actually create a new transformer, press the New button at the bottom of the dialog box. Another Transformer dialog box will appear after Design Master asks you to enter the callout for the new transformer you are creating.
Listed below are all the different fields and inputs found in the dialog box above. These fields all help to define the transformer in some way and are divided into three main categories. The first portion focuses on the definition of the transformer itself, followed by the fault analysis information, and then the specifications of the transformer feeder wires.
General Transformer Definition
Field |
Sets |
KVA |
The KVA rating for the transformer. |
K-Rated |
Toggles whether or not the transformer is K-rated or not. |
Primary Volts |
Voltage going into the transformer. |
Secondary Volts |
Voltage coming out of the transformer. |
Number of Lugs |
Sets the number of lugs available to tap out of on the transformer. |
Select Block Based upon KVA |
When sizing the transformer block that will be inserted on the plan view, this toggles whether or not to size that block based on the KVA rating. |
Plan View Block |
The size of the transformer block on the drawing. |
Custom Dimension |
Input for defining customized transformer block sizes. |
Layer System |
Indicates what layering system the transformer block will be drawn on. |
Location |
Where you can select the transformer schedule graphic to associate with the transformer. |
Note 1 |
Creates a note that may be inserted with the transformer on the one line diagram. |
Note 2 |
Creates a note that may be inserted with the transformer on the one line diagram. |
Fault Analysis
Field |
Sets |
Transformer Primary Length (ft) |
Length of the conductor from the device feeding the transformer. It can be automatically calculated by Design Master, or input manually. |
Fault @ Transformer Primary (amps) |
The fault current on the primary side of the transformer. |
Transformer Impedance % |
Percentage of impedance through the transformer. |
Fault @ Transformer Secondary |
The fault current on the secondary side of the transformer. |
Secondary Breaker AIC Rating |
The AIC Rating for the breaker on the secondary side of the transformer. Must be specified by the user, and may be set at custom levels in the field below. |
Feeder Specification
Field |
Sets |
Fed From |
Displays where the transformer is fed from. This is set in the One Line Device Connections box. |
Description in Upstream Device |
How this panel appears in the schedule of the device feeding it. Defaults to Transformer Callout, but may be customized |
Primary OCP |
Size of upstream breaker or fuse in the device feeding the transformer. |
Conductor Amps |
Select automatic sizing for the conductors, or use this field to select a specific conductor size. |
Neutral |
Choose to size the neutral wire at 100% or 200% of the phase conductors, select a specific conductor, or have no neutral at all. |
Ground |
Choose to automatically size the ground per the NEC as a service or equipment ground, or select a specific size. |
Conduit Size |
Choose to size the conduit automatically, or select a specific conduit size. |
IG Conductor |
Toggle on or off an Isolated Ground conductor. |
Size |
This field displays the conduit and feeder sizes for the transformer, based on the settings above. |
The New, Copy, Save, Delete, Rename, and Find buttons work as they do for panels.