Metering equipment symbols

IEC 60417-5172

Protective class II equipment

• To identify equipment meeting the safety requirements specified for Class II equipment (double or reinforced insulation).

ISO 7000-0434B

Caution

• To indicate that caution is necessary when operating the device or control close to where the symbol is placed. To indicate that the current situation needs operator awareness or operator action in order to avoid undesirable consequences.

ISO 7000-1641

Operator's manual; operating instructions

• To identify the location where the operator's manual is stored or to identify information that relates to the operating instructions. To indicate operating instructions should be considered when operating the device or operating controls close to where the symbol is placed.