AS NZS 61439.2:2016 pdf free.Low-voltage switchgear and controlgear assemblies Part 2: Power switchgear and controlgear assemblies.
8.3.2 Clearances
Addition:
For withdrawable parts, the isolation provided in the isolated position shall at least comply with the requirements in the relevant specification for disconnectors (see IEC 60947-3). This applies with the equipment in new condition, taking account of the manufacturing tolerances and anticipated changes in dimensions due to wear.
The isolating distance between the withdrawable unit main contacts and their associated fixed contacts in the isolated position shall be capable of withstanding the test voltage for the declared impulse withstand voltage as specified in Table 102.
8.4.3.2.2 Requirements for earth continuity providing protection against the consequences of faults within the ASSEMBLY
Replacement of the title:
8.4.3.2.2 Requirements for earth continuity providing protection against the consequences of faults within the PSC-ASSEMBLY
Replacement of last paragraph:
When removable or withdrawable parts are equipped with a metal supporting surface, these surfaces shall be considered sufficient for ensuring earth continuity of protective circuits provided that the pressure exerted on them is sufficiently high. The continuity of the protective circuit of a withdrawable part shall remain effective from the connected position to the isolated position inclusively.
8.4.6.1 Devices to be operated or components to be replaced by ordinary persons
This subclause of Part 1 is not applicable.
8.4.6.2 Requirements related to accessibility in service by authorized persons
Additional subclause:
8.4.6.2.101 Operating and maintenance gangways within a PSc-ASSEMBLY
Operating and maintenance gangways (see 3,102.1 and 3.102.2) within an ASSEMBLY shall comply with the requirements for basic protection as specified in lEG 61140. The design and construction of such gangways shall be agreed upon between ASSEMBLY manufacturer and user.
Recesses within a PSC-ASSEMBLY of limited depth, in the order of 1 m, are not considered to be gangways.
8.5.2 Removable parts
Replacement of the title:
8.5.2 Removable and withdrawable parts
Replacement of text:AS NZS 61439.2 pdf download.