Cable Connection; Power Cables - ABB UniGear ZS1 Instruction Manual

5.9 Cable connection

Figure 100: View into the cable connection compartment,
max. six parallel cables are possible
6.1 Earthing switch position indicator
17 Floor cover, split
17.2 Reducer ring
23 Cable connection bar
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5.9.1 Power cables

The standard method for entry of power cables in the switchgear is shown in Figures 100, 101.
The cables are conveyed from below through floor covering 17, which is divided at the cable entry point.
The cables go through rubber reducer rings 17.2, which can be adapted to the required cable diameter
in a range from 27 to 62mm. Cables are fastened in the panel by means of cable clamps mounted on
cable strips, which are part of the panel floor covering. The clamps make it possible to fasten cables
with diameters between 35 and 54mm.
Cable sealing ends are mounted on the cable cores according to the manufacturer's instructions. It
is possible to use cable sealing ends of different manufactures (e.g. Pirelli, Raychem etc.), but it is
necessary to keep the length of the cable ends, including cable sealing ends, which is given by the
distance of cable connecting bars 23 from the panel floor covering.
These bars have different versions, hich differ in their number of parallel cables and the values of rated
and short-circuit currents. See ig. Figure 102÷106.
The bars are equipped with holes for M16 screws. If M12 screws are used for cable connections, special
washers with the diameter for M12 screws must be used. In all cases, the earthing of cable screens
is carried out on the strip-holding cable clamps. The cable strip is connected to the earth potential.
It is also possible to place the removable arrangement of voltage transformers in the cable
compartment. These can be fitted with HV fuses similar to those in the measuring panel. Three fixed
mounted surge arresters can also be installed here. But in both these cases the number of parallel
cables must be reduced – see the table.
The cable connections bars are equipped with holes for M16 screws, but they are supplied
without screws, washer and nuts.
The supply of this material, according to the cable termination, is at Customer charge.
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6.1
23
19.1 21
17.2
17
Figure 101: Partial view of the cable compartment,
prepared here for connection of
triple cables.
17
17.2
19
19.1
19.2
21
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17 17.2 19
Floor cover, split
Reducer ring
Main earthing bar
Connecting link
Earthing connection pin
Cable clamp
Mounting rail, connected to earth
potential
19.2