IEC 61386-21:2021 pdf download

IEC 61386-21:2021 pdf download.Conduit systems for cable management – Part 21: Particular requirements – Rigid conduit systems
1 Scope
Clause 1 of IEC 61386-1:2008 is applicable, except as follows:
Addition:
This part of IEC 61386 specifies the requirements for rigid conduit systems.
2 Normative references
Clause 2 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as follows:
Addition:
IEC 61386-1:2008, Conduit systems for cable management – Part 1: General requirements
IEC 61386-1:2008/AMD1:2017
3 Terms and definitions
Clause 3 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
4 General requirements
Clause 4 of IEC 61386-1:2008 is applicable.
5 General conditions for tests
Clause 5 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable.
6 Classification
Clause 6 of IEC 61386-1:2008 is applicable, except as follows: Classifications 6.1.1, 1; 6.1.2, 1; 6.1.3, 2; 6.1.3, 3; 6.1.3, 4; 6.1.4, 1; and 6.1.5, 1 are not applicable. NOTE Rigid conduit systems according to 6.1.1, 2 and 6.1.2, 2 and classification 1 from 6.2.1, Table 1 are not allowed in France.
7 Marking and documentation
Clause 7 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as follows:Addition: 7.1.101 The conduit shall be marked in accordance with 7.1 along its entire length at regular intervals of preferably 1 m but not longer than 3 m and each length shall be marked at least once. Compliance is checked by inspection. 7.1.102 The manufacturer shall document, for the conduit system, the minimum inside diameter and the classification in accordance with Clause 6. Compliance is checked by inspection of the documentation. 7.1.103 The manufacturer shall declare whether the conduit is bendable and provide all information, instructions and, if necessary, bending aids for proper and safe bending of the conduit. Compliance is checked by inspection and by the tests specified in 10.4 and 10.6.
8 Dimensions
Replacement: 8.1 Threads and outside diameters shall comply with IEC 60423. Compliance is checked by means of the gauges specified in IEC 60423. 8.2 Threadable conduits and threadable conduit fittings, except terminating conduit fittings, shall comply with Table 101. Non-threadable conduit fittings, except fittings which are part of a conduit system declaring tensile strength, shall comply with Table 102. The minimum inside diameter of the conduit system shall be as declared by the manufacturer. Compliance is checked by measurement.
10 Mechanical properties
Clause 10 of IEC 61386-1:2008 and of IEC 61386-1:2008/AMD1:2017 are applicable, except as follows: 10.2 Compression test Subclause 10.2 is applicable with the following addition: 10.2.4 Add the following note at the end of Subclause 10.2.4: NOTE In order to achieve a uniformly increasing compression force, the force indicated in Table 4 is divided by time; this value is the required rate per second to fulfil the requirement. Example: For a test force of 750 N an increase of the test force of 25 N/s is required (750 divided by 30 equals 25). Informative Annex AA gives detailed calculations including tolerances for time and force. 10.4 Bending test Replacement: Conduits which are declared by the manufacturer as being bendable are tested in accordance with 10.4.101, 10.4.102 or 10.4.103. Addition: 10.4.101 Metallic conduits 10.4.101.1 Conduit sizes 16, 20 and 25 are subjected to a bending test by means of the apparatus shown in Figure 101. Testing of other sizes is in accordance with the manufacturer’s instructions.When the bent conduit is held in such a position that the straight portions are at an angle of approximately 45° to the vertical, one end of the sample pointing upwards and the other downwards, it shall be possible to pass the appropriate gauge as shown in Figure 102 through the sample under its own weight and without any initial speed. 10.4.102 Non-metallic conduits 10.4.102.1 Conduit sizes 16, 20 and 25 are subjected to a bending test by means of the apparatus shown in Figure 103. The length of the sample is 500 mm ± 10 mm. Testing of other sizes is in accordance with the manufacturer’s instructions. 10.4.102.2 A bending aid, in the form of a coiled spring of square section metal wire, without burrs and having an overall diameter between 0,7 mm and 1,0 mm less than the specified minimum inside diameter of the conduit, or a bending aid recommended by the manufacturer, is inserted into each sample before bending. 10.4.102.3 The sample with the bending aid inserted is conditioned for at least 2 h in a refrigerator within which the temperature is maintained at the declared temperature as given in Table 1 with a tolerance of ±2 °C. The test is carried out within 12 s ± 2 s after the removal of the sample from the refrigerator. 10.4.102.4 Each sample is placed in position as shown in Figure 103, and held lightly in the groove of the former by means of the clamp. The sample is bent round the former by moving the bending rollers so that, when released, it has an angle of (90 ± 5)°. In this position, it shall be possible to remove the bending aid without damage to the sample or the aid.