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No.
Symbol
13
14
15
16
17
18
19
Approved Standards
Description
IEC60417
Protective earth
No.5019
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 electrode.
IEC60417
Earth
No.5017
To identify an earth (ground) terminal in
cases where neither the symbol No.13 is
explicitly required.
IEC60417
Alternating current
No.5032
To indicate on the rating plate that the
equipment is suitable for alternating
current only; to identify relevant
terminals.
IEC60417
Direct current
No.5031
To indicate on the rating plate that the
equipment is suitable for direct current
only; to identify relevant terminals.
IEC60417
Class II equipment
No.5172
To identify equipment meeting the safety
requirements specified for Class II
equipment according to IEC 61140.
ISO 3864
General prohibition
To identify actions or operations that are
prohibited.
ISO 3864
Contact prohibition
To indicate injury that could occur due to
touching a specific part of the equipment.
302
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