Chapter1 Introduction
ATE Series User Manual 1-8 ni.com
•InstallationCategory 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
distributioncircuits and circuit breakers. Other examples of
InstallationCategory III are wiring including cables, bus-bars, junction
boxes,switches, socket outlets in the building/fixedinstallation, and
equipmentfor industrial use, such as stationary motors with a
permanent connection to the building/fixedinstallation.
•Installation Category IVis formeasurement sperfo rmed at the source
of the low-voltage(<1,000 V) installation.
Examples of InstallationCategory IV are electric meters, and
measurements on primary overcurrentprotection devices and
ripple-control units.
Belowis a diagram of a sample installation.