Teledyne Lecroy HVD3000 Operator's Manual page 39

HVD3000 / HVD3000A High-Voltage Differential Probes
IEC/EN 61010-031 Definitions
IEC/EN 61010-031/A1:2008
Measurement Category III (CAT III) applies to test and measuring circuits connected to the
distribution part of the building's low-voltage mains installation.
Measurement Category II (CAT II) applies to test and measuring circuits connected directly
to utilization points (socket outlets and similar points) of the low-voltage mains installation.
Measurement Category I (CAT I) applies to test and measurement circuits that are not
intended to be directly connected to the mains supply.
Pollution Degree 2 refers to an operating environment where normally only dry non-
conductive pollution occurs. Conductivity caused by temporary condensation should be
expected.
IEC/EN 61010-031:2015
Measurement Category III (CAT III) applies to test and measuring circuits connected to the
distribution part of the building's low-voltage mains installation.
Measurement Category II (CAT II) applies to test and measuring circuits connected directly
to utilization points (socket outlets and similar points) of the low-voltage mains installation.
No Rated Measurement Category applies to other circuits that are not directly connected to
the mains supply.
Pollution Degree 2 refers to an operating environment where normally only dry non-
conductive pollution occurs. Conductivity caused by temporary condensation should be
expected.
NOTE: The 2015 version of the standard eliminates the Measurement Category I (CAT I)
rating for test and measuring circuits that are not intended to be directly connected to the
mains supply. However, this change in rating designation does not reduce the
measurement capability or the level of protection offered by the new probe design when
compared to the probes that were originally certified per the 2008 version of the standard.
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