IEC 60950-22 pdf download

IEC 60950-22 pdf download.INFORMATION TECHNOLOGY EQUIPMENT – SAFETY – Part 22: Equipment to be installed outdoors
1 Scope
1.1 Equipment covered This part of IEC 60950 applies to information technology equipment intended to be installed in an OUTDOOR LOCATION . The requirements for OUTDOOR EQUIPMENT also apply, where relevant, to OUTDOOR ENCLOSURES suitable for direct installation in the field and supplied for housing information technology equipment to be installed in an OUTDOOR LOCATION . 1.2 Additional requirements Each installation may have particular requirements. Some examples are given in 4.2. In addition, requirements for protection of the OUTDOOR EQUIPMENT against the effects of direct lightning strikes are not covered by the standard. For information on this subject, see IEC 62305-1 .
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60950-1 and the following apply. 3.1 OUTDOOR LOCATION location for equipment where protection from the weather and other outdoor influences provided by a building or other structure is limited or non-existent 3.2 OUTDOOR EQUIPMENT equipment specified by the manufacturer to be installed where exposed wholly or partly to the conditions in an OUTDOOR LOCATION Note 1 to entry: TRANSPORTABLE EQUIPMENT , for example, a laptop or notebook computer, or a telephone, is not OUTDOOR EQUIPMENT unless specified by the manufacturer for continuous use in an OUTDOOR LOCATION . 3.3 OUTDOOR ENCLOSURE part of OUTDOOR EQUIPMENT that is exposed to the adverse conditions in an OUTDOOR LOCATION and that is intended to protect the interior of the equipment from those conditions Note 1 to entry: An OUTDOOR ENCLOSURE can also perform the functions of one or more of the following: a FIRE ENCLOSURE ; an ELECTRICAL ENCLOSURE ; a MECHANICAL ENCLOSURE . Note 2 to entry: A separate cabinet or housing into which the equipment is placed can provide the function of an OUTDOOR ENCLOSURE.
4 Conditions for outdoor equipment
NOTE 1 The temperature values are based on IEC 60721 -3-4 class 4K2. These temperatures do not take into account severe environments (for example, extremely cold or extremely warm), nor do they include provision for heating by radiation from the sun (solar loading). NOTE 2 Attention is drawn to IEC 61 587-1 for additional information on performance levels C1 , C2 and C3 . NOTE 3 In Finland, Norway and Sweden, the temperature in winter can be extremely low. For OUTDOOR EQUIPMENT this will demand special design so that the equipment can stand transport, erection and operation/service at temperatures down to –50 °C. 4.2 Mains supply 4.2.1 General Mains-operated OUTDOOR EQUIPMENT shall be suitable for the highest MAINS TRANSIENT VOLTAGE expected in the installation location. Consideration shall be given to the following: – the prospective fault current of the supply to OUTDOOR EQUIPMENT can be higher than for indoor equipment, see IEC 60364-4-43; and – the MAINS TRANSIENT VOLTAGE for OUTDOOR EQUIPMENT can be higher than for indoor equipment. Within a certain overvoltage category, components within OUTDOOR EQUIPMENT that reduce the MAINS TRANSIENT VOLTAGE or the prospective fault current shall comply with the requirements of the IEC 61 643-series. NOTE 1 The overvoltage category of OUTDOOR EQUIPMENT is normally considered to be one of the following: – if powered via the normal building installation wiring, overvoltage category II; – if powered directly from the mains distribution system, overvoltage category III; – if at, or in the proximity of, the origin of the electrical installation, overvoltage category IV. NOTE 2 For further information regarding protection from overvoltages, see IEC 60364-5-53. Compliance is checked by inspection of the equipment and the installation instructions.4.2.2 Mains transient voltage on AC mains supply Equipment that is part of the building installation, or that may be subject to transient overvoltages exceeding those for overvoltage category II, shall be designed for overvoltage category III or IV, unless additional protection is to be provided internally or externally to the equipment. In this case, the installation instructions shall state the need for such additional protection. Clearances in equipment designed for overvoltage category III or IV shall comply with Annex G of IEC 60950-1 :2005. The insulation system used in such equipment shall be capable of withstanding the test voltage given in Table 5C of IEC 60950-1 :2005/AMD2:201 3.