Cables single-core

Table A16.20 Rating factors for single core cable in trefoil circuits laid on open racks in air...

Table A16.23 Group rating factors for circuiis of three single core cables in trefoil and touching, horizontal formation laid directly ...

Table A16.26 Rating factors for variation in thermal resistivity of soil, three single-core cables laid directly in the ground (three cables in trefoil, touching)...

When tising only single-core cables, the same method should be adopted, as discussed above. Groups may be made of 3, 3- - or 4 cores (R. Y, B or R, Y, B and N) of single-core cables, and one CBCT used in circular or rectangular form, whichever is more convenient, for each group. 

ISO 6722 Road Vehicles—60V And 600V Single-Core Cables—Dimensions, Test Methods And Requirements, ISO, Geneva, Switzerland, 2006. 

Figure 6.55 High power high voltage cage induction motor with cable termination system according to Fig. 6.54 with single core cables.

Copper is generally the preferred material for cable conductors used in the oil industry. Aluminium is seldom choseu for conductors. It is sometimes used for the armouring of single-core cables that carry AC, or DC, if a substantial AC ripple is present e.g., DC, motors fed from a thyristor controlled power source. 

A similar reduction in rated current occnrs when several conductors are combined in one cable. Single-core cables can carry more current than three or fonr core cables. Vertically run cables carry less cnrrent than those run horizontally by a factor of approximately 5%, dne to the convection of heat given ont by the lower part of the cable. 

Note For the spacing of supports for oables having an overaii diameter exceeding 40 mm, and for single-core cables having conductors of cross-sectional area 300 mm and larger, the manufacturer s... 

The tong tester, or clip-on ammeter, works on the same principle as the transformer. The laminated core of the transformer can be opened and passed over the busbar or single-core cable. In this way a measurement of the current being carried can be made without disconnection of the supply. The construction is shown in Fig. 4.21. 

Electrochemical regeneration of the membrane was attempted after the membrane was used. When an increasing current was apphed on a test membrane, the carbon starts to bum at 100 ttiA cmrent. Hence, the electric current far below this failure limit was used. To apply the cmrent, the single core cables were attached to the feed side membrane surface with conductive glue that was heat cured at 65-70°C or 10 min. The permeation test results are given in Table 4.7 and Fig. 4.22. 

We will now discuss the wave propagation characteristics of a three-phase single-core cable. Figure 3.13 and Table 3.2 show a cross section and the parameters of a tunnelinstalled cable. 

Tuimelinstalled cable represented by a PT cable (a) configuration of a three-phase single-core cable and (b) cross section of a single-core cable. 

ClThree single-core cables with insulation of the same colour may be used if identified at the terminations. ... 

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