Line

Figure 1: Auto Coordination Options- Line

Option Descriptions
Option Description

For LV devices, set line ampacity protection using

Select the cable protection method from the following:

  • LTPU settings amps: Adjusts LTPU settings of solid state trip such that the LTPU nominal amps are lower than the downstream cable.
  • LTPU min tolerance amps: Adjusts LTPU settings of solid state trip such that the LTPU minimum tolerance amps are lower than the downstream cable.

Allow one setting past line ampacity limit for LTPU selection

When the check box is selected, LTPU setting is set to the next setting past the cable ampacity. As per NEC, this is enabled only when the amp rating is 800A or less.

How should the LTPU selection of LV devices be prioritized?

Enables you to select the method for coordinating solid state trip and cable.

  • Use closer selectivity with downstream protective devices: The solid state trip device coordinates with downstream protective devices.
  • Use line ampacity: The cable ampacity is used to set the LTPU setting amps, without comparing with downstream protective devices.

Tolerance allowed before showing underutilized warning

If the trip amps of the device is lower than the cable ampacity by the specify tolerance, the report indicates that the cable is underutilized.

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