IEC 61439-2:2009 pdf free download

IEC 61439-2:2009 pdf free download
IEC 61439-2:2009 pdf free download.Low-voltage switchgear and controlgear assemblies
8.5.2.1 01 General
The removable and withdrawable parts shall be so constructed that their electrical equipment can be safely isolated from or connected to the main circuit whilst this circuit is live. The removable and withdrawable parts may be provided with an insertion interlock (see 3.2.5 of Part 1 ). Minimum clearances and creepage distances (see 8.3 of Part 1 and 8.3.2 above) shall be complied with in the different positions as well as during transfer from one position to another.
NOTE It may be necessary to ensure that these operations are not performed under load.
8.5.2.1 03 Withdrawable parts
Withdrawable parts shall have in addition an isolated position (see 3.2.1 03) and may have a test position (see 3.2.1 02), or a test situation (see 3.1 .1 02). They shall be distinctly located in these positions. These positions shall be clearly discernible.
In PSC-ASSEMBLIES with withdrawable parts all live parts shall be protected in such a manner that they cannot unintentionally be touched when the door, if any, is open and the withdrawable part is withdrawn from the connected position or removed. Where an obstacle or shutter is used they shall meet the requirements of 8.4.5.2.5 of Part 1 , and warning labels shall be provided.
For the electrical conditions associated with the different positions of withdrawable parts, see Table 1 03.
8.5.2.1 04 Interlocking and padlocking of withdrawable parts
Unless otherwise specified, withdrawable parts shall be fitted with a device, which ensures that the apparatus can only be withdrawn and/or re-inserted after its main circuit has been interrupted.
In order to prevent unauthorized operation, withdrawable parts may be provided with means for a padlock or lock to secure them in one or more of their positions.
Typical arrangements of internal separation by barriers or partitions are described in Table 1 04 and are classified as forms (for examples, see Annex AA). The form of separation and higher degrees of protection shall be the subject of an agreement between ASSEMBLY Manufacturer and User.