Motors

Rated kV for the motors. The motor rated voltage must be defined in the library. Use Add New to create new voltage levels. Each kV level has its own design template. The motor voltage in the one-line must be exactly equal to the voltage defined in the library for Auto-Design to work. A mismatch of voltage yields no results. You can add any number of voltage levels for motors. To view or edit data for any voltage level, select the kV first. To delete a kV value, delete all the cells in the spreadsheet for that kV.

Rated horsepower (HP) for the motor for which circuit is to be designed. The HP for the motor in the one-line must match the design library Motor HP. You must enter the Motor HP before you can enter other details for that circuit. Deleting the Motor HP deletes the details.

Note: The cables and protective devices in the motor circuits are designed as per the motor HP.

Full-load current for the motor based on National Electric Code (NEC 2005), Table 430.250. The FLA is determined from motor voltage and size (HP).

This is NEC FLA multiplied by a factor of 1.25.

Continuous current rating for the device protecting the motor circuit.

Type of protective device such as fuse or circuit breaker. This field is currently used for database purposes only and is not used in calculations.

Details of the phase conductors for motor circuits.

Number of conductors in each phase.

Core construction such as 1/C, 3/C, and so on.

NEC/UL insulation designation.

Size of conductor in AWG or kcmil.

Maximum operating temperature for the cable based on insulation type. This is defined in the cable data library, and is automatically filled in once you select the cable details.

Conductor material—either copper (Cu) or aluminum (Al).

Details of ground conductors for motor circuits.

Number of ground conductors.

Size of conductor in AWG or kcmil.

Details of conductor raceway.

Type of enclosure for cables, such as conduit, tray, air, burial, and so on.

Material type for the enclosure, such as steel aluminum, PVC, and so on.

Number of conduits.

Diameter of conduits in inches.

Current carrying capacity of the cables for continuous loads. The program automatically obtains the ampacity values from the cable library.