IEC 61058-2-4-2018 pdf free.Switches for appliances – Part 2-4: Particular requirements for independently mounted switches.
adequate space between the underside of the base and the surface on which the base ismounted or between the sides of the base and the enclosure (cover or box) so that, afterinstallation of the switch，the insulation of the conductors does not come in contact withlive parts of different polarity or with moving parts of the mechanism, such as the spindleof a rotary switch;
NOTE This requirement does not imply that the metal parts of the terminals are necessarily protected byinsulating barriers or insulating shoulders to avoid contact, due to incorrect installation of the terminal metalparts, with the insulation of the conductor.
easy fixing of the base to a wall or in a box and correct positioning of the conductors.Forsurface-type switches,mounted on a mounting plate，a wiring channel may be needed tocomply with this requirement.
ln addition，switches classified according to 7.101.1(design A switch) shall permit an easypositioning and removal of the cover or cover plate，without displacing the conductors.
Compliance is checked by inspection and by an installation test with conductors of the largestcross-sectional area for the relevant terminal size, in Table 4.
12.103 Covers and cover plates or parts thereof，which are intended to ensure protectionagainst electric shock, shall be held in place at two or more points by effective fixing.
Covers and cover plates or parts thereof may be fixed by means of a single fixing，forexample by a screw， provided that they are retained in position by another means (e.g.by ashoulder).
lt is recommended that the fixings of covers and cover plates or parts thereof be captive.Theuse of tight fixing washers of cardboard or the like is deemed to be an adequate method forsecuring screws intended to be captive.
NOTE Live parts and non-earthed metal parts separated from live parts in such a way that creepage distancesand clearances have values specified in Clause 20 are not considered as accessible if the requirements of 12.103are met.
For switches with a degree of protection IPX0，the fixing of covers or cover plates shall notserve to fix any other part, except the knobs.
When the fixings of covers or cover plates also serve to fix the base, there shall be sufficientmeans to maintain the base in position after removal of the cover or cover plate.
Decorative covers, cover plates or parts thereof not providing protection against electric shockare not considered as covers or cover plates within the meaning of 12.103.
For covers and cover plates or parts thereof whose fixing is of the screw-type, compliance ischecked by inspection and by an installation test.
For covers and cover plates or parts thereof whose fixing is not dependent on screws andwhose removal is obtained by applying a force in a direction approximately perpendicular tothe mounting/supporting surface,compliance is checked by applying the test described in13.3.2 of lEC 60669-1:2017 under the conditions set out in 20.4 to 20.6 of IEC 60669-1:2017.IEC 61058-2-4 pdf download.