IEC 60227-6:2001 pdf download

IEC 60227-6:2001 pdf download.Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 v-Part 6: Lift cables and cables for flexible connections.
Values in parentheses are the non•preferred types.
The conductors shall comply with the requirements given in lC 60228 for class 5 conductors.
The conductors of the cores in the side position may consist of copper wires and steel wires. The nominal geometric cross-sectional area of these conductors shall be equal to that of the other conductors and the maximum resistance shall be not more than twice the maximum resistance of a copper conductor of the same nominal cross-sectional area.
3.3.2 InsulatIon
The insulation shall be polyvinyl chloride compound of type PVCID applied around each conductor.
The insulation thickness shall comply with the specified value given In table 4. column 2.
The insulation resistance shall be not less than the value given in table 4, column 3.
3.3.3 Arrangements of cores and strain-bearing members, if any
The cores shall be laid parallel. It is permitted, however, that two, three, four or five cores may be laid in groups: in such cases, a tearing thread may be inserted inside each group II shall be possible to separate the cores without damage to the insulation.
Strain-bearing member(s) of textile material may be used.
A strain-bearing member (Or members) of metal may also be used; in such a case (cases) it (they) shall be covered with a non-conducting abrasion-resistant material.
If the cores are grouped, the groups shall comply with the following table 2:
Table 2 — Cores groups
The nominal value of the clearance e, separating the groups Is given In table 5. column 2 (see also figure 1).
There is no requirement for the mean value of the clearance e. However, any clearance separating the groups may be less than the nominal value a1 provided that the difference does not exceed 0.2 mm + 20 % of the nominal value.
3.3.4 Sheath
The sheath shall be a polyvinyl chloride compound of type PVC/ST5 applied around the cores.
The sheath shall be applied so as to substantially avoid the formation of cavities, and shall not adhere to the cores. The edges of the cable shall be rounded off.
3.4 Tests
Compliance with the requirements of 3.3 shall be checked by inspection and by the tests given In table 6 except that, owing to the rectangular cross-section of the cable, the following modifications and additions shall be taken into account. Where applicable, 3.4.1 to 3.4.5 inclusive shall be read in conjunction with the relevant tests specified in table 6.
3.4.1 Pressure test at hIgh temperature for sheaths
If the smaller sides of the cable are fully rounded in shape, this test shall be carried out on one of the smaller sides in accordance with 8.2 of IEC 60811-3-1. To calculate the compressing force, 0 is the minor dimension of the cable and 5 is the mean sheath thickness Oj as determined in 8.1.4 of IEC 60811-1-1.
If the smaller sides are flat, or nearly flat, as depicted in figure 1. this test shall be carried out in accordance with 8.2 of IEC 60811-3-1. with the meihod modified as follows:
a) Preparation of test piece
A strip shall be cut from the wide side of the cable in the direction of the axis of the cable. On the inner side, only the ridges shall be removed by grinding or cutting, The width of the strip to be tested shall be at least 10 mm but not more than 20 mm, The thickness of the strip shall be measured at the place where the compressing force F is applied.
b) Position of lest piece In the test apparatus
The strip shall be bent around a mandrel having a diameter approximately equal to the diameter of the core of the cable; the longitudinal axis of the strip shall be perpendicular to the axis of the mandrel. Provision shall be made that the inner surface of the strip shall be in contact over at least 120 of the circumference of the mandrel (see figure 2). The metal blade of the test apparatus shall be placed on the middle of the test piece.