Equipment Tab

EasyPower's customizable options are set up under Tools > Options.

Select the Equipment tab of the Options dialog box.

Figure 1: Equipment Tab of Options Dialog Box

Option Descriptions
Option Description

X/R Calculation for Grouped Motors

For the purpose of X/R calculation, EasyPower enables you to set the average Hp for ANSI codes <50 group, >50 group, and Lumped group as chosen in the Motor Data dialog box.

For IEC, you can set the averages for the 37 kW group, >37 kW group, and Lumped group.

The options that appear are controlled by the short circuit calculation method set on the System tab.

Code Factors – Design

This factor is used to calculate the design kVA (or amp) values in for bus equipment. The code factor kVA (or amp) value is multiplied by this factor to obtain the design size.

Relay Calibration Multiple

The database reports for relays display the calibration amps and seconds at the specified multiples of pickup.

Cable Derating Based on

The LV cable ampacity calculations include the derating for ambient temperature based on this selection.

  • <None>: No derating is applied for ambient temperature.
  • US: The derating for ambient temperature is applied as per NEC (NEC 2005, Tables 310.16 - 310.19, pages 142 – 145).
  • CSA: The derating for ambient temperature is applied as per CEC (CEC 2006, Part I, Table 5A, page 283).

Schedule Defaults – Scale

The graphical scale of schedules inserted in the drawings.

Auto-fill LV breaker trip with min values

When the Manufacturer, Type and Style are chosen for the trip, the settings are automatically selected at the minimum possible in the dialog box.

Include motor contribution for short circuit

You can select whether to include or exclude current contribution from the motors when performing ANSI short circuit calculations. For IEC, the motor current contributions are always shown regardless of this setting.

Show fields and X/R calculations based on IEC 60909 (GB/T 15544)

When this option is selected, fields such as RG (ohms), pG, and RDf/X"d are enabled in the Impedance tab of the Generator Data dialog box, which enables calculation of the X/R ratio based on IEC 60909.

This check box is automatically selected for newly created one-lines if the default short circuit calculation method is set to IEC-60909 (GB/T 15544).

Use 75 C cable in air rating table for Raceway Type Air

Select this check box to use the 75° C rating for conductor ampacity in free air conditions as per the terminal ratings established in the NEC 310 tables. By default, this check box is not selected based on the NEC requirement of the use of ampacity for 75°C cable in a cable or conduit.

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