National Instruments SCB-68 User Manual page 23

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installation, and equipment for industrial use, such as stationary
motors with a permanent connection to the building/fixed installation.
• Installation Category IV is for measurements performed at the source
of the low-voltage (<1,000 V) installation.
Examples of Installation Category IV are electric meters, and
measurements on primary overcurrent protection devices and
ripple-control units.
Below is a diagram of a sample installation.
1-13 SCB-68 Shielded Connector Block User Manual
Chapter 1 Introduction