Kyoritsu 2009R Manuale Utente Scaricare il pdf (Pagina 6)

○Measurement categories (Over-voltage categories)

To ensure safe operation of measuring instruments, IEC61010

establishes safety standards for various electrical environments,

categorized as CATⅠ to CATⅣ, and called measurement

categories. Higher-numbered categories correspond to electrical

environments with greater momentary energy, so a measuring

instrument designed for CATⅢ environments can en

dure greater

momentary energy than one designed for CATⅡ.

CAT Ⅰ : Secondary electrical circuits connected to an AC electrical

outlet through a transformer or similar device.

CAT Ⅱ : Primary electrical circuits of equipment connected to an AC

electrical outlet by a power cord.

CAT Ⅲ : Primary electrical circuits of the equipment connected

directly to the distribution panel, and feeders from the

dis

tribution panel to outlets.

CAT Ⅳ : The circuit from the service drop to the service entrance,

and to the power meter and primary over-current protection

device (distribution panel).

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Kyoritsu 2009R Manuale Utente Pagina 6