BS/EN 61914-2016 pdf download.Cable cleats for electrical installations.
9.3 Lateral load test
The cleat is mounted on a test rig as shown in Figure 2, or a similar arrangement. The mounting surface cart be made of steel or aluminium plate, plywood or other material. For the purpose of applying the load, a rigid mandrel of circular, or other appropriate cross-section. is positioned within the cleats aperture. For cleats and intermediate restraints taking more than one cable, the appropriate number of mandrels is used. Where more than one mandrel is used the load shall be applied to a mandrel furthest from the mounting surface. Care is taken to ensure that the load acts through the centre line of the mandrel. The mandrel size is the minimum for which the cleat is designed.
For metallic cable cleats, the declared load is applied gradually and held for a period of (601) mm.
For non-metallic and composite cleats, the sample assembly is placed in a full draft air-circulating oven. The tests are carried out after the oven temperature has reached and maintained the declared maximum temperature from Table I with a tolerance of (j) °C. The load is applied gradually and then held for a period of (601) mm.
A cable cleat intended for a single mounting orientation shall be tested in that orientation and that orientation shall be declared in the documentation.
A cable cleat intended for multiple mounting orientations shall be tested In each mounting orientation using separate samples. The test load on one set of samples shall be applied perpendicular to the mounting surface (Figure 2a or Figure 2b), and to the second set of samples parallel to the mounting surface (Figure 2c or Figure 2d).
When it can be determined that a particular mounting orientation represents the most onerous condition, the results of the tests in that orientation may represent all mounting orientations.
Care must be taken to ensure that there is adequate restraint for the cables at each end of the cable run to be tested.
Annex B may be used to calculate the theoretical forces that may be created during short circuits in order to plan testing.
9.5.2 For cable cleats and Intermediate restraints classified In 6.4.4
Cleats and intermediate restraints classified under 6.4.4 shall comply with the following
requirements:
– there shall be no failure that will affect the in tended function of holding the cables in place;
– the cable cleats and the intermediate restraints, if used, shall be intact with no missing parts including all devices used to secure the cleats to the mounting surface:
– there shall be no cuts or damage visible to normal or corrected vision to the outer sheath of each cable caused by the cable cleats or by the intermediate restraints, if used.
9.5.3 For cable cleats and intermediate restraints classified In 6.4.5 Cleats and intermediate restraints classified under 6.4.5 shall comply with the inspection requirements of 9.5.2 after the first and after the second short-circuit applications. After a second short-circuit application, a voltage withstand test is performed by applying a minimum test voltage of 2,8 kV d.c. or 1,0 kV a.c. for a period of (6O) s according to the provisions of IEC 60060-1:2010, Clause 5, Tests with direct voltage or Clause 6, Tests with alternating voltage. The voltage withstand test shall be administered between the cable cores, which should be connected together, and the mounting frame. The mounting frame shall be bonded to the earthing system. The cable jackets and mounting frame shall be pre-wetted with sufficient water to facilitate a current leakage path along the outer jacket for (2) mm before the test begins.
The cables shall meet the requirements of the voltage withstand test without failure of the insulation.
10 Fire hazards
10.1 Flame propagation
Non-metallic and composite cable cleats and intermediate restraints shall have adequate resistance to flame propagation.
Compliance is checked by the following test.BS/EN 61914-2016 pdf download.

Share on Facebook

Post on X

Follow us

Save