BS EN 60950-22:2006 pdf download

BS EN 60950-22:2006 pdf download.Information technologyequipment- Safety -Part 22: Equipment installed outdoors.
62 LImited current circuits In outdoor locations
The requirements of 2.4 of IEC 60950—1, apply without change
7 Wiring terminals for connection of external conductors
The mains supply terminations for OUTDOOR EOutPMENT that Is intended to be powered:
— via the normal building installation wiring, shall be as specified in 3.3 of IEC 60950-1;
— directly from the mains distribution system, shall be as specified in IEC 60364,
NOTE For other t.rnlm&s, IEC 60950.1 applies
Compliance is checked by inspection.
8 ConstructIon requirements for outdoor enclosures
8.1 General
Protection against corrosion shall be provided by the use of suitable materials or by the application of a protective coating applied to the exposed surface, taking into account the intended conditions of use.
Parts, such as dials or connectors, that serve as a functional part of en OUTDOOR ENCLOSURE shall comply with the same environmental protection requirements as for the OUTDOOR
ENCLOSURE.
NOTE I Aspects affecting safety which require the integrity of the OUtDOOR ENCLOSURE through tile life of the product include
— continued protection against impact:
– continued protection against ingress of dust and water:
— continued provision of earth continuity.
An OUTDOOR ENCLOSURE shall not be used to carry current during normal operation if this could cause corrosion that would impair safety. This does not preclude connection of a conductive part of an OUTDOOR ENCLOSURE to protective earth for the purpose of carrying fault Currents.
NOTE 2 The action of a current hewing through a ,oint can increase corrosion undef wet cOsidit.ons
Where a conductive part of an OUTDOOR ENCLOSURE is connected to protective earth for the purpose of carrying fault currents, the resulting connection shall meet the requirements of 2.6 of IEC 60950-1, after the appropriate weather conditioning tests, see 8.3.
Compliance is checked by inspection and, if necessary, by the tests of 2.6 of tEC 60950-1 and 8.3 of this standard.
8.2 Resistance to ultra-violet radiation
Non-metallic parts of an OUTDOOR ENCLOSURE required for conipliance with this standard shall be sufficiently resistant to degradation by ultra-violet (UV) radiation.
8.3.2 Test apparatus
The apparatus for the salt spray test comprises a test chamber and spraying devices as described in IEC 60068-2-11.
The apparatus for the test In a water-saturated sulphur dioxide atmosphere comprises an Inert. hermetically sealed, chamber containing a waler-saturated sulphur dioxide atmosphere (see Annex A) in which the test specimens and their supports are held. The chamber is as described In Iso 3231.
8.3.3 T.st procedure
The test is comprised of two identical and successive 12 day periods.
Each 12 day period is comprised of test a) followed by test b):
test a) — 168 I, of exposure to the salt spray atmosphere. The concentration of the saline solution forming the salt spray atmosphere is 5 % i I % by weight and the temperature of the test chamber is maintained at 35 ‘C ± 2 “C.
test b) — 5 exposure cycles each consisting of an 8 fri exposure to a water-saturated sulphur dioxide-rich atmosphere. (see Annex A). during which the temperature of the test chamber is maintained at 40 “C ± 3 ‘C • followed by 16 h at rest with the test chamber door open.
After each 12 day period, the test specimens are washed with demineralized water.
8.3.4 Compliance criteria
Corn pliance is checked by visual inspection. The equipment shall not show rust, cracking or other deterioration. However, surface corrosion of the protective coating is permitted. In case of doubt, reference shalt be made to ISO 4628-3 to verify that the samples conform to specimen Ru.
8.4 Bottoms of fir, enclosures
The bottom of a FIRE ENCLOSURE of OUTDOOR EQUIPMENT shall comply with 4,6.2 of IEC 60950-1. except there are no requirements for the bottoms of FIRE ENCLOSURES of OUTDOOR EQUIPMENT provided that the Installation instructions specify that the equipment is to be mounted directly and permanently on a non-combustible surface (such as concrete or metal). There is no need for a marking on the equipment.
Compliance is checked by inspection,
8.5 Gaskets
When gaskets are used as the method providing protection against the Ingress of potential contamInants, 8.5.1 through 8.5.3 shall apply as appropriate.