TENTECH MD10KVx Manual De Uso página 5

Measurement Categories (CAT)
CAT II - Measurement Category II
Measurement Category II corresponds to measurements taken on circuits directly
connected to low-voltage installations.
CAT III - Measurement Category III
Measurement Category III corresponds to measurements on building installations.
CAT IV - Measurement Category IV
Measurement Category IV corresponds to measurements taken at the source of
low-voltage installations.
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