DOCA0170EN-06

ERMS Test

The ERMS test is the recommended method for testing the arc energy reduction settings in compliance with NEC 240.87 (c).

You can perform ERMS test on the communicating MicroLogic P and H trip units with the firmware version 8.282 or later.

The ERMS mode is controlled by an optional IO module added to the IMU and configured to perform the pre-defined application 3 or the ERMS user-defined application.

Before running the ERMS test, you must activate the ERMS mode by using a selector switch connected to the IO module. When the ERMS mode is engaged, ERMS is displayed on the MicroLogic trip unit display and a light connected to output O3 is in the ON state.

For more information, refer to:

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