Terms And Symbols - Cal Test Electronics CT4071 User Manual

Terms and Symbols

The following symbols appear on the product or in its documentation:
Direct current
Both direct and alternating current
Caution, possibility of electric shock
Caution, see documentation for details
Double insulation
Earth Ground
Definitions
Measurement Category II (CAT II) refers to local-level electrical distribution,
such as that provided by a standard wall outlet or plug-connected
equipment. Examples of CAT II measurements would be household
appliances, portable tools, and similar modules.
Measurement Category III (CAT III) refers to measurements on hard-wired
equipment in fixed installations, distribution boards, and circuit breakers
that form part of a building wiring installation. Other examples are wiring,
including cables, bus bars, junction boxes, switches, socket outlets in the
fixed installation, and stationary motors with permanent connections to
fixed installations
Pollution Degree 2 refers to an operation environment where normally only
dry, non-conductive pollution occurs. Temporary conductivity caused by
condensation can be expected.
Working CAT rating is equal to that of the lowest rated element
within the test set-up.
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