IEC 60309-2:2021 pdf download.Plugs, fixed or portable socket-outlets and appliance inlets for industrial purposes
7 Marking
Clause 7 of IEC 60309-1:2021 applies except as follows:
7.1 Replace the sentence before the compliance statement at the end of the subclause by the following paragraphs.
The symbol indicating the position of the earthing contact or of the minor key or keyway shall be placed before or above the value for the rated operating voltage and separated from it by a line.
These markings shall be placed after the marking for rated current, separated from it by a dash if an oblique line separates the symbol indicating the position of the earthing contact or of the minor key or keyway from the value for the rated operating voltage.
If a symbol for nature of supply is used, it shall be placed after or below the marking for rated operating voltage.
For three-phase accessories it is not necessary to mark the voltage phase to neutral, if any.
The marking for rated current(s), position of the earthing contact or the minor key, keyway,rated operating voltage(s) and nature of supply accordingly may be as follows.
For accessories having rated operating voltages exceeding 50 V, the symbol indicating the position of the earthing contact shall be a numeral followed by the letter h.
The numeral is derived from the position of the earth contact tube, when compared with the face of a clock, the socket-outlet being viewed from the front with the keyway at the sixth hour.
For accessories having rated operating voltages not exceeding 50 V, the symbol indicating the position of the minor key shall be a numeral followed by the letter h.
The numeral is derived from the position of the minor key, when compared with the face of aclo ck, the socket-outlet being viewed from the front with the major key at the sixth hour.
For plugs and appliance inlets, the symbol indicating the position of the earthing contact or the minor keyway shall be the same as that for the corresponding socket-outlet.
Contact tubes of socket-outlets shall be positioned in the clockwise order when viewed from the front as shown in the standard sheets (see also 7.5).
Pins of plugs and appliance inlets shall be positioned in the opposite order viewed from the front.
7.4 Replace the existing text with the following:
For plugs and portable socket-outlets, the marking specified in 7.1 shall be easily discernible when the accessory is wired ready for use.
The marking for insulation voltage shall be on the main part; it shall not be visible when the accessory is mounted and wired as in normal use.
NOTE The term "ready for use" does not imply that the plug or portable socket-outlet is engaged with its complementary accessory.
Compliance is checked by inspection.IEC 60309-2 pdf download.