Wire Ampacities

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

Wire Ampacities Dialog Box

wire-ampacities-dialog-box

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 section.

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.

Copy: Creates a copy of the selected sizing option.

Delete: Deletes the current sizing option.

Wire Ampacity Section

Each row in the grid 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.

Breaker Ampacity: The ampacity of the breaker.

Wire Ampacity @ 30°C: The ampacity of the wire at an ambient temperature of 30°C. This value is multiplied by the number of parallel runs to determine the final wire ampacity.

Temperature Rating of Conductor: The temperature rating of the phase wires.

Description: A label used to differentiate 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 Size: The size of the phase wires.

Ground Wire Size, Service: The size of the service ground. This sizing should be selected based upon NEC Table 250.102(C)(1).

Ground Wire Size, Equipment: The size of the equipment ground. This sizing should be selected based upon NEC Table 250.122.

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. This value 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. This value 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 the breaker size is used when sizing standard branch circuits. Only one breaker of each size can have this box checked. You do not need to have this box checked for each size breaker.

Standard, Equipment Circuit: Whether 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 need to have this box 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 need to have this box checked for each wire ampacity.

New: Creates a new wire ampacity. The settings for the current wire ampacity will be duplicated to create the 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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