IEEE C62.43.1-2020 pdf free download – IEEE Guide for Surge Protectors and Surge Protective Circuits Used in Information and Communication Technology Circuits (ICT), Including Smart Grid—Part 1 Applications
4. Environmental conditions 4.1 Service conditions Two categories of operating temperature and humidity for the application of surge protectors are covered in this guide. Each category has an associated range of temperature and relative humidity. If an enclosure is used for testing, it should be wired and mounted according to its intended use. The temperature and humidity listed below are the ambient air test conditions. a) Controlled temperature and humidity Temperature: 2 °C to 50 °C, unless otherwise specifed. Relative humidity: 10% to 80% b) Uncontrolled temperature and humidity Temperature:
40 °C to 70 °C, unless otherwise specifed. Relative humidity: 5% to 96%, except that above 50 °C the relative humidity can be reduced to 20%
4.2 Test temperature and humidity Where only one extreme temperature is specifed for a characteristic, or if the specifed range is narrower than the full range of 4.1, the extreme temperature or narrow range represents the generally accepted worst- case test condition for a generic protector technology within the application. If it is known beforehand that a particular device technology causes a surge protector to be insensitive to temperature when testing a particular characteristic, a room temperature within the range 20 °C to 25 °C can be used instead for that test. If a temperature for a particular test is not specifed, the specifcation value can be measured at any temperature within the range of temperatures for the application (see 4.1). Tests related to lightning-caused surges need not be done at temperatures below –20 °C. The humidity of the test laboratory should be recorded during the test. The humidity should be in the range 30% to 60% relative humidity to avoid possible damage to test equipment, such as ESD.
4.3 General environmental considerations After manufacture, SPDs have to be transported, possibly with intervening storage, and installed. The IEC 60721 series [B13], Classifcation of Environmental Conditions, covers environmental parameters and their severities for the following situations:
— Storage
— Transportation
— Stationary use at weather protected locations
— Stationary use at non-weather protected locations
— Ground vehicle installations
— Ship installations
— Portable and non-stationary use
Part 3 of the IEC 60721 series [B13] relates the estimated environmental conditions for the preceding situations to the environmental testing procedures given in the IEC 60068 series, Environmental Testing [B9]. See Annex A for more details on environmental considerations and the use of these documents.
4.4 Environmental parameters for weather protected locations The controlled temperature and humidity service condition is similar to the IEC 60721 class 3K3 environment [B13]. The uncontrolled temperature and humidity service condition is similar to the IEC 60721 class 3K7 environment [B13] that has the possibility of condensation and ice formation. See Table 1.IEEE C62.43.1 pdf download.