National Instruments NI PCI-6110 User Manual
Page 17
Chapter 1
Introduction
© National Instruments Corporation
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Examples of Installation Category II are measurements on household
appliances, portable tools, and similar equipment.
•
Installation Category III is for measurements performed in the building
installation. This category is a distribution level referring to hardwired
equipment that does not rely on standard building insulation.
Examples of Installation Category III include measurements on
distribution circuits and circuit breakers. Other examples of
Installation Category III are wiring including cables, bus-bars, 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.
•
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.