26 Operation principle and hardware description
Type designation label
The type designation label has an IEC and NEMA rating, C-UL US, and CSA markings,
a type code and a serial number, which allow individual recognition of each unit. The
first digit of the serial number refers to the manufacturing plant. The next four digits
refer to the manufacturing year and week, respectively. The remaining digits
complete the serial number.
The type designation label is located on the front cover and the serial number label
inside the unit. Example labels:
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