No.
Symbol mark
13
14
15
16
17
中
文
简
体
18
中
文
繁
19
體
20
21
12
Approved
standards
IEC60417
No. 5019
IEC60417
No. 5017
IEC60417
No. 5032
IEC60417
No. 5031
IEC60417
No. 5172
ISO 3864
ISO 3864
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Meaning
Protective earth
To identify any terminal which is in-
tended for connection to an external
conductor for protection against electric
shock in case of a fault, or the terminal of
a protective earth electrode.
Earth
To identify an earth (ground) terminal in
cases where symbol No. 13 is not explic-
itly required.
Alternating current
To indicate on the rating plate that the
equipment is suitable for alternating cur-
rent only; to identify relevant terminals.
Direct current
To indicate on the rating plate that the
equipment is suitable for direct current
only; to identify relevant terminals.
Class II equipment
To identify equipment meeting the
safety requirements speci ed for Class II
equipment according to IEC 61140.
General prohibition
To identify actions or operations that are
prohibited.
Contact prohibition
To indicate injury that could occur due
to touching a speci c part of the equip-
ment.
Never look into the projection lens while
the projector is on.
To indicate that the marked item don't
place anything on projector.