Wire Ampacities

Allows you to create wire ampacity configurations and wire sizing options. Opens the following dialog box:

Wire Ampacities

wire-ampacities

Sizing Option Section

Each row in the grid lists a sizing option. Each sizing option controls which wire ampacity configurations are used when sizing wires automatically. The selected sizing option controls the values displayed in the Standard column in the Wire Ampacity grid.

Name: The name of the sizing option.

Active: The sizing option that is currently being used to size feeders.

New: Creates a new sizing option.

Delete: Deletes the current sizing option.

Wire Ampacity Section

Each row in the grids lists a wire ampacity configuration. Each ampacity can have multiple configurations. One configuration will be selected as the default and used when sizing feeders automatically. The other configurations can be chosen when sizing feeders manually.

Ampacity: The ampacity of the wire.

Description: A label used to differentiate the wire ampacities of the same size. The combination of the Ampacity and Description fields must be unique for each row. The label will be displayed in other dialog boxes. It is not displayed in the schedules or on the plan.

Wire Type: A list of the wire groups in the project. The wire sizes listed in the other columns will be based upon the selected group.

Wire Size: The size of the phase wires.

Ground Wire Size, Service: The size of the service ground. This sizing should be selected based on the NEC for service ground sizing.

Ground Wire Size, Equipment: The size of the equipment ground. This sizing should be selected based on the NEC for equipment ground sizing.

Parallel Runs: The number of parallel runs of conduits. Each run contains the same size wires

X: The reactance for a single run of this size wire. See NEC Table 9 for values. It is divided by the number of parallel runs to determine the final reactance for the wire ampacity.

R: The resistance for a single run of this size wire. See NEC Table 9 for values. It is divided by the number of parallel runs to determine the final reactance for the wire ampacity.

Conduit Type: The conduit group that will be used when sizing the conduit.

Standard, Branch Circuit: Whether or not the breaker size is used when sizing standard branch circuits. Only one breaker of each size can have this box checked. You do not have to have it checked for each size breaker.

Standard, Equipment Circuit: Whether or not the breaker size is used when sizing branch circuits based upon the MCA and MOCP of equipment connected to them. Only one breaker of each size can have this box checked. You do not have to have it checked for each size breaker.

Standard, Feeder: Whether the wire ampacity is used when sizing feeders. Only one wire ampacity of each size can have this box checked. You do not have to have it checked for each wire ampacity.

New: Creates a new wire ampacity.

Delete: Deletes the current wire ampacity.

Move Up: Moves the current wire ampacity up in the list. Use this button to sort wire ampacities of the same size in the list. It cannot be used to move wire ampacities so they are no longer in numerical order.

Move Down: Moves the current wire ampacity down in the list. Use this button to sort wire ampacities of the same size in the list. It cannot be used to move wire ampacities so they are no longer in numerical order.


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