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MEASUREMENT CATEGORY
®
The categories take into account the total continuous energy
available at the given point of circuit, and the occurrence of
impulse voltages. The energy can be limited by circuit breakers or
fuses, and the impulse voltages by the nominal level of voltage.
Maximum rated voltage of this device is 1000V AC or DC.
CAT III is for circuits which can be connected to the mains
installation of a building. Energy is limited by circuit breakers to
less than 110 000VA with the current not exceeding 11 000A.
CAT IV includes circuits which are connected directly to the
source of power for a given building. There are very high levels of
available energy (e.g. limited only by the power transformer) and
arc flash can occur.
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