Quantum Composers LDDC 1550 - Manual (Page 32)

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IEC 417, No. 5172
Equipment protected by double insulation or reinforced insulation (equivalent to
Class II if IEC 60536).
ISO 3864, No. B.3.1
Background colour - yellow; symbol and outline – black
Caution - (refer to accompanying documents) used to direct the user to the
instruction manual where it is necessary to follow certain specified instructions
where safety is involved. Colour requirements do not apply to markings on
equipment if the symbol is moulded or engraved to a depth or raised height of
0.5 mm, or that the symbol and outline are contrasting in colour with the
background.
IEC 417, No. 5104
Start (of action).
IEC 417, No. 5110
Stop (of action).