Low voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear - Clause 537: Isolation and switching
General Any device for isolation and switching according to Sections 462 to 465 shall comply with the relevant requirements included in this clause. General and common requirements of Clause 530.4 apply. NOTE 1 In certain instances@ additional requirements may be necessary for combined functions. NOTE 2 The Table A.1 of the Annex A summarizes the functions provided by the devices for isolation and switching@ together with indication of the relevant product standards. NOTE 3 For some applications such as motor control@ the switching equipment needs to withstand the inrush current. Where an installation or an item of equipment or enclosure contains live parts connected to more than one supply@ a durable warning notice shall be placed in such a position that any person before gaining access to live parts@ will be warned of the need to isolate those parts from the various supplies unless an interlocking arrangement is provided to ensure that all the circuits concerned are isolated.