Chapter 1
Introduction
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National Instruments Corporation
1-7
junction boxes, switches, socket outlets in the building/fixed
installation, and equipment for industrial use, such as stationary
motors with a permanent connection to the building/fixed installation.
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Installation category IV is for measurements performed at the source
of the low-voltage (<1,000 V) installation.
Examples of category IV are electric meters, and measurements on
primary overcurrent protection devices and ripple-control units.
Below is a diagram of a sample installation.