Metering equipment symbols
The following IEC 60417 and ISO 7000 symbols may be used on the metering equipment:
Symbol Reference Title and description
IEC 60417-5017
Earth; ground
To identify an earth (ground) terminal in cases where
neither the symbol 5018 nor 5019 is explicitly required.
IEC 60417-5018
Functional earthing; functional grounding (US) *
To identify a functional earthing (grounding) terminal, for
example, of a specially designed earthing (grounding)
system to avoid causing malfunction of the equipment.
IEC 60417-5019
Protective class I; Protective earth/ground
To identify any terminal which is intended for connection
to an external conductor for protection against electric
shock in case of a fault, or the terminal of a protective
earth (ground) electrode.
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, refer to accompanying documents
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.
* There may be national differences concerning the use of this symbol.
** Protective class equipment requirements are outlined in IEC 61140.
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