AS NZS 60079.5:2015 pdf free download – Explosive atmospheres Part 5: Equipment protection by powdered filling ‘q’

AS NZS 60079.5:2015 pdf free download – Explosive atmospheres Part 5: Equipment protection by powdered filling ‘q’.
4.1.3 Degree of protection of the container
The container of the electrical equipment, parts of electrical equipment, or Ex components protected by powder filling “q”, in their normal service condition. I.e. with all openings closed as in normal use, shall comply at least with the degree of protection 1P54 as defined in IEC 60529. If the degree of protection is 1P55 or higher, and the container is not hermetically sealed, the container shall be provided with a breathing device. The container with the breathing device in place shall comply at least with the degree of protection 1P54 according to IEC 60529. The test shall be conducted on an empty container without the powder filling installed. At the end of any water ingress tests, no water shall be visible inside the container.
NOTE I As the container may need to be destroyed in order to determine the entrance of dust or water, two separate test samples could be required for the two Ingress teals.
NOTE 2 When the container is also the external enclosure, the tests of enclosures requirements of IEC 60079-0 aPply.
The ingress protection of containers or parts of electrical equipment protected by powder filling q, intended for use only in clean, dry rooms, may be reduced to degree of protection 1P43. The certificate number of this equipment shall include the X” suffix in accordance with the marking requirements of IEC 60079-0, and the Specific Conditions of Use listed on the certificate shall detail the restrictions of use.
When Ex components protected by powder filling ‘q are intended to be mounted inside another enclosure complying with IEC 60079-0. this outer enclosure shall have a degree of protection of at least 1P54, The IP rating of the inner container does not need to be specified provided that the Ex component is mounted in a position where it is unlikely to be contaminated by any small amounts of water that may enter the outer enclosure.
NOTE 3 The impact and drop tests of enclosures from IEC 60079-0 do not generally apply to Ex components intended to be mounted inside another enc’osure complying with IEC 60079-0, as th. external enclosure provides the protection against impact and drop.
The maximum gap of a container protected by powder filling q shall be at least 0,1 mm smaller than the specified smallest dimension of the filling material.
NOTE 4 The restriction on the size of the gap is intended to reduce the escape of filling material.
4,1.4 Filling procedure
Filling shall be carried out so as not to leave any void within the filling material (for example
by shaking down) The free space within electrical equipment, parts of electrical equipment or
Ex components protected by powder filling q” shall be effectively filled with filling material
(see also 4.3.2).
4.1.5 ContaIners that are not external enclosures
The container of type of protection q equipment or Ex Component that is installed or intended to be installed internal to another enclosure is considered the same as that of an Ex Component.
4.3.2 Distances surrounding free space
If electrical equipment contains components which have an enclosed free space not filled with the filling material (e.g. a relay), the following requirements apply:
— if the enclosed free space of the component is less than 3 cm3, the minimum distance through the filling material between the component wall and the inner surface of the container shall comply with Table 1. The reduced distances are not permitted;
— if the enclosed free space of the component is between 3 cm3 and 30 cm3, the minimum distance through the filling material between the component wall and the inner surface of the container shall comply with Table I but with a minimum of 15 mm;
— the component shall be fixed, so that movement nearer to the wall of the container is not possible.