MCC - Description Tab

This is a spreadsheet listing similar to the Device Library. When you place a new MCC on the one-line, the first time you open its database dialog and click on the Description tab, EasyPower displays the MCC Spreadsheet Creation Wizard which enables you to select the number of rows you want. Clear the check box at the bottom of the Wizard dialog if you don't want it to appear with each new MCC. You can insert or append new rows in the spreadsheet if you need them later.

Figure 1: MCC Spreadsheet Creation Wizard Dialog Box

Figure 2: Description Tab of MCC Data Dialog Box

When you click on the Description tab, additional buttons become available on the toolbar. These enable you to perform actions related to the spreadsheet. See Additional MCC and Panel Spreadsheet Options for more information.

Option Descriptions
Option Description

MCC Library

The list contains all of the same schedules as the Device Library. To enter a listing other than those contained in the list, create a new page in the MCC section of the Device Library. See EasyPower Device Library for more information.

Schedule

This list enables you to specify which Device Library Schedule your chosen Library Load spreadsheet is located in. To enter a listing other than those contained in the list, create a new page in the MCC section of the Device Library. See EasyPower Device Library for more information.

Export

The spreadsheets can be exported to metafiles (.WMF) or delimited database text files (.CSV). Export is beside the Print button on the MCC/Panel dialog box toolbar when the viewing the Description tab.

Spreadsheet

Note: The Section Space and Equipment Name are not necessary for calculation purposes but are used to match the way they are organized in the MCC.

Option Descriptions
Option Description

Section Space

Enter the location of the individual bucket in the MCC. Typical entries would be 1A, 1B, 2A, 2B, 2C, and so on.

Equipment Name

Enables you to identify each piece of equipment.

Phasing

The phasing for the connected load. The options are 3PH (3-phase), AB, BC, CA, AN, BN, or CN.

Note: Your phase descriptions may be different than described here if they have been customized in Tools > Options > Terminology.

Library Load

This list corresponds directly to the Library Load column in the Device Library. After you have made selections in the MCC Library, Schedule and Library Load fields, all of the data cells that follow are automatically filled in when you click on another cell. You can also double-click on the cell to enter something different than what is listed.

Status

The third column is a toggle "On/Off" to indicate if this particular item is currently connected to the MCC schedule. This affects the power flow and short circuit current contribution.

Load Type

You can select different kinds of loads such as motors, loads, or sub-MCC/panel. Based on the load type selected, various analysis are possible. When you select a load type, the cells in the row that do not apply become unavailable. You might see a Data button indicating you need to enter data specific to the load type. Cells highlighted in red require data in order to perform any analysis. The following load types are available:

  • Motor: The motor data required for analysis are usually Motor HP (U.S., CSA) or kW (metric), Motor X/R, and the X/R Ratio in the Short Circuit tab. The required data fields are highlighted in red. If you do not know the motor X/R ratio, you can calculate typical X/R ratio for the motor based on size by selecting the cell for Motor X/R and clicking Calculate in the toolbar or by pressing F9 on the keyboard. A motor contributes to the short circuit current. You can enter other data in the row, such as cable description, protective device, starter description and capacitor data. When you select Motor as a load type, you can plot its curves on the TCC plot.

    • Note: Motor FLA for 3-phase motors is calculated as follows. For U.S. units, the NEC table FLA values are used. For metric units, motor FLA is calculated as Motor kW/(Motor Eff * Motor power factor * Equipment kV * SQRT3).

  • Load: The load data is entered in the columns Static kW and Static kVAR. Other data entries are optional. You cannot plot curves for devices in the TCC plot.

  • VFD (non-regen): Non-regenerative variable frequency drive. The motor data required for analysis are usually Motor HP (U.S., CSA) or kW (metric), Motor X/R, and the X/R Ratio in the Short Circuit tab. The required data fields are highlighted in red. If you do not know the motor X/R ratio, you can calculate typical X/R ratio for the motor based on size by selecting the cell for Motor X/R and clicking Calculate in the toolbar or by pressing F9 on the keyboard. You can enter other data in the row, such as cable description, protective device, starter description and capacitor data. When you select VFD as a load type, you can plot its curves on the TCC plot.

  • Sub-MCC: This means the current MCC is feeding another MCC. You need to specify the sub-MCC ID name and the cable connecting the two MCCs. You also need to enter the protective device data for the sub-MCC. You can plot the protective device curve on a TCC.
  • Sub-Panel: This is similar to a sub-MCC type, except it is used when connecting the MCC to a sub-panel.
  • Motor w/ TCC: The load type is motor. However, you can plot the cable damage curve, protective device trip curve and the motor starting curve on a TCC plot. You need to specify the motor data, protective device data and the cable data.
  • Load w/ TCC: You can plot the curves for cable and protective device on a TCC plot. The load is specified in kW and kVARs.
  • VFD w/ TCC: The load type is motor with a variable frequency drive (VFD). However, you can plot the cable damage curve, protective device trip curve and the motor starting curve on a TCC plot. You need to specify the motor data, protective device data and the cable data.
  • <50 HP Lump: This is to model a group of motors all of which are under 50 HP rating. No TCC plot is obtained for this type of load.
  • >50 HP Lump: This is to model a group of motors all of which are larger than 50 HP rating. No TCC plot is obtained for this type of load.
  • <37 kW Group (metric only): This is to model a group of motors all of which are under a 37 kW rating. No TCC plot is obtained for this type of load.
  • >37 kW Group (metric only): This is to model a group of motors all of which are larger than a 37 kW rating. No TCC plot is obtained for this type of load.

The rest of the fields correspond directly to those in the Device Library. See EasyPower Device Library for more information.

For more information on the MCC spreadsheet, see the following topics:

More Information