BS EN 60691 pdf free download

BS EN 60691 pdf free download. Thermal-links – Requirements and application guide.
4 General requirements
4.1 Adequate protection of the equipment against excessive temperatures not only depends upon the properties of the thermal-link but also to a large extent upon the mounting of the thermal-link in the equipment. Therefore, in addition to good engineering practice, the requirements of the application guide in Annex A shall be considered.
4.2 Thermal-links shall have adequate electrical and mechanical strength and shall be : constructed so as to withstand all conditions of handling likely to be encountered during mounting and normal use, when used within the requirements of this standard.
4.3 When a thermal-link changes its state of conductivity， no arc or flame shall be maintained, nor material expelled that might impair the surrounding area or otherwise create a risk of electric shock or fire. For thermal-links using melting strips or wires, care should- -be taken to prevent molten material from short-circuiting or bridging creepage distances and clearances in air, so as to reduce the risk of impairing the insulation system of the equipment. After it has functioned, the thermal-link shall not be damaged when subjected to temperatures not exceeding Tm, in such a way that the safety of the equipment with regard to risk of electric shock hazard and electrical breakdown is impaired. The thermal-ink shall not reclose after it has operated.
4.4 For requirements for thermal-link packaged assemblies, see Annex H.
5 General notes on tests
5.1 The test conditions are as follows.
5.1.1 Unless otherwise specified, only tests that are not required to be performed inside an environmental chamber and/or test oven shall be carried out under the following atmospheric conditions:
— temperature: 15 °C to 35 °C,
— relative humidity: 25 % to 75 %,
— air pressure: 8,6 x iO Pa to 1,06 x iO Pa.
The required atmospheric conditions during testing can be controlled when carrying out the tests and during the duration of the tests. The required atmospheric conditions do not have to be maintained in a test laboratory when tests are not performed.
5.1.2 Where the conditions given in 5.1.1 have a significant influence, they shall be kept substantially constant during the tests.
5.1.3 If the temperature limits given in 5.1.1 are too wide for certain tests, these shall be repeated, in case of doubt, at a temperature of (23 ± 1) °C.
5.2 In every test report, the ambient temperature shall be stated. If the standard conditions for relative humidity or pressure are not fulfilled during the tests, a note to this effect shall be added to the report.
5.3 If the result of a test is influenced, to an appreciable extent, by the position and method of mounting of the specimen, the most unfavourable condition shall be chosen for the relevant tests and recorded.
5.4 If a thermal-link has been specifically designed for use in a special type of equipment and cannot be tested separately, the tests of this standard shall be performed in that equipment or in the relevant part of it, or similar.
5.5 When testing a homogeneous series of thermal-links, all the tests shall be applied to thermal-links with the lowest and highest Tf. Thermal-links with intermediate rated functioning temperatures need only be subjected to tests according to 10.3, 11.3, 11.4 and 11.5.BS EN 60691  pdf download.