Symbol

Publication

Description / Comments

IEC 417, No. 5031

Direct current. Vdc may be used on rating labels.

IEC 417, No. 5032

Alternating current. For rating labels, the symbol is typically replaced by V and Hz as in 230V, 50Hz. DO NOT USE Vac.

IEC 417, No. 5033

Both direct and alternating current

IEC 617-2
No. 02-02-06

Three-phase alternating current

IEC 417, No. 5017

Earth (ground) terminal. Primarily used for functional earth terminals which are generally associated with test and measurement circuits.  These terminals are not for safety earthing purposes but provide an earth reference point.

IEC 417, No. 5019

Protective conductor terminal. This symbol is specifically reserved for the protective conductor terminal and no other. It is placed at the equipment earthing point and is mandatory for all grounded equipment

IEC 417, No. 5020

Frame or chassis terminal. Used for points other than protective conductor and functional earth terminals where there is a connection to accessible conductive terminals to advise the user of a chassis connection.

IEC 417, No. 5021

Equipotentiality Used in applications where it is important to indicate to the operator that two or more accessible functional earth terminals or points are equipotential.  More for functional rather than for safety purposes

IEC 417, No. 5007

On (Supply) Note that this symbol is a bar, normally applied in the vertical orientation. It is not the number 1.

IEC 417, No. 5008

Off (Supply) Note that this symbol is a true circle. It is not the number 0 or the letter O.

IEC 417, No. 5172

Equipment protected by double insulation or reinforced insulation (equivalent to Class II if IEC 60536)

ISO 3864, No. B.3.6
Background colour - yellow; symbol and outline - black

Caution, risk of electric shock Generally used only for voltages in excess of 1000 V.  It is permissible to use it to indicate lower voltages if an explanation is provided in the manual. 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. 5041 Background colour - yellow; symbol and outline - black

Caution, hot surface 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.

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. 5268-a

In-position of bistable push control

IEC 417, No. 5269-a

Out-position of bistable push control