BS EN-60691-2016 pdf free download.Thermal-links — Requirements and application guide (IEC 60691:2015 + COR1:2016)
6.3 Resistance to tracking
With regard to resistance to tracking, the following ranges are used:
a) proof tracking index from 1 75 to 249;
b) proof tracking index greater than or equal to 250.
NOTE These ranges are based on test methods for surface tracking laid down in IEC 601 1 2.
7 Marking
7.1 Each thermal-link shall be marked with the following:
a) type or catalogue reference;
b) manufacturer’s name or trade mark;
c) rated functioning temperature T f with or without the symbol T f followed by the number of degrees Celsius (marked with °C or C);
d) date code which identifies the date of manufacture and which does not repeat for at least 1 0 years, and a factory location or code, stamped on the thermal-link or the smallest packaging.
If there is only one factory, the factory location may be omitted.
Catalogue or reference numbers should define those parameters such as temperature, current and voltage, which together classify a thermal-link.
7.2 The rated functioning temperature T f may be omitted if a different type or catalogue reference is employed for each different functioning temperature.
7.3 Marking shall be indelible and legible.
Compliance with the requirements for Indelibility of markings is checked by the test in Annex G using the apparatus shown in Figure G.1. Legibility is checked by inspection. After the ageing tests of 11.4, compliance is checked by inspection.
.4 The marking in accordance with a), b), c) and d) in 7.1 shall be printed additionally on the packing, together with a reference to this standard.
7.5 If the thermal-link is small in size, and not intended to be replaced, the markings in accordance with b) to d) in 7.1 shall be printed on the packaging, together with a reference to this standard.
Compliance is checked by inspection.
8 Documentation
The manufacturer shall provide in the technical documentation, catalogues or instructional
leaflets the following information, in addition to that required in Clause 7:
a) classification in accordance with Clause 6;
b) for each of the classifications;
1 ) characteristic temperatures T f , T h ,
2) characteristic currents I r ,
3) rated voltage U r ;
c) suitability for sealing in, or use with impregnating fluids or cleaning solvents;
d) information for mounting the thermal-link in the equipment.
e) thermal-links small in size and not intended to be replaced.
For reasons of safety, it should be made clear in the documentation that a thermal-link is a non-repairable item and that, in case of replacement, an equivalent thermal-link from the same manufacturer and having the same catalogue reference should be used, mounted in exactly the same way.
f) the position of the metal screen, if it is located at a distance other than 1 2,7 mm away from the live parts in the case of a thermal-link having an exposed element.
9 Constructional requirements
9.1 General
9.1.1 Thermal-links shall have adequate mechanical strength and stability so as to withstand the stresses likely to be encountered during handling, normal use and fault conditions of the relevant end-use equipment.
9.1.2 Tab terminals shall be constructed in accordance with IEC 61 21 0 and the maximum permissible temperature of the used Tab materials shall be in accordance with Table A.1 of IEC 61 21 0:201 0 (Tabs / Integrated).
9.1.3 Current-carrying parts shall be constructed in such a way that contact pressure is not transmitted through non-metallic material other than ceramic, or any material considered as having sufficient dimensional stability over the range of temperatures to be expected, unless there is sufficient resilience in the corresponding metal parts to compensate for any shrinkage or distortion of the non-metallic material.
Current-carrying parts shall have the necessary mechanical strength, be capable of carrying the rated current and shall be of a material that is acceptable for the particular application.
For current-carrying parts, temperature limits should be considered according to Table 1 3 of IEC 60730-1 :201 3.BS EN-60691 pdf download.