MV cable connection boxes types SZK, SZPO-6

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Purpose

The cable junction boxes type SZK are designated for installation in AC three-phase systems of 50 Hz frequency and rated voltage up to 12 kV. They are used to connect power cables to flexible cables between the switchgear and motor with a possibility to ground them in case of inspection, maintenance, renovation or failure. Surge arresters can also be installed. They are designed to be installed in overhead conditions.
Rubber sheathed cable junction box type SZPO-6 is designated for installation in AC three-phase systems of 50 Hz frequency and rated voltage up to 7,2 kV. The box is used to connect rubber sheathed (mining) cables on the area of opencast mines. It is designed for installation in overhead conditions.

Application

  • for connecting cables between switchgear and motor,
  • in open-pit mining,
  • in industrial plants.

General characteristics

The box construction is made of steel sheets. It is painted in accordance with the technology of environmentally friendly powder paints, in colour according to the customer’s request. Provides a high degree of users protection in case of possible short circuit inside the box. The cooper buses are mounted on the suport insulators. Boxes 6.4, 6.6, and 6.7-1 have grips for attaching portable grounding device after disconnection. Versions 6.5, 6.8 with eatrhing switch UWEb-12-650 have isolators with voltage divider and a stationary voltage indicator.
The correct connections sequence between the switchgear and the earthing switch is ensured by the BZ lock.
Through cable ducts, the SZK box can connect up to two three-wire cables with a cross-section of up to 240 mm2 made of aluminium or cooper and two rubber sheathed cables up to 185mm2 made of cooper.
Through cable ducts, the SZPO-6 box can connect up to two three-wire cables with a cross-section of up to 150+25 mm2 and an outer diameter of up to 90 mm2.

Features

  • reliability,
  • functionality,
  • airtigtness,
  • simplicity of use,
  • the security of personnel,
  • high quality,
  • a wide range of designs.

Work conditions

SZK and SZPO-6 boxes are intended for overhead operation in the zone with moderate climate on land, where environmental factors ensure normal conditions according to PN-EN 62271-200, PN-EN 62271-1.

Cable junction boxes SZK 6.7-1 typeBox SZK 6.5-1 type

Cable junction boxes SZK 6.5-2 typeCable junction boxes SZK 6.5-2 type 

  1. transport handle
  2. slider pin
  3. BZ interlock
  4. earthing switch handle
  5. voltage indicator
  6. padlock handle
  7. grounding clamp
  8. box construction
  9. safety flap
  10. door lock
  11. earthing switch
  12. door
  13. front cover
  14. bus connection cable
  15. cover of the lower part of the box (option)
  16. support insulator
  17. condensation hole cover
  18. cable bushing
  19. surge arrestor
    21. fabric filter

Technical data

Type 6.4-1 6.4-2 6.5-1 6.5-2 6.6-1 6.6-2 6.7-1 6.8 SZPO-6
Rated voltage   12 7,2 12 7,2
Power frequency withstand voltage   28 20 28 20
Lightning impulse withstand voltage   75 60 75 60
Rated current:
normal
short-time withstand current
peak withstand current
  400
31,5/1
80
630
31,5/1
80
400
40/1
100
630
40/1
100
400
31,5/1
80
630
31,5/1
80
400
31,5/1
80
1000
50/1
125
400
16/1
40
Internal arc withstand current   31,5
/0,1
31,5
/0,1
40/0,1 40/0,1 31,5
/0,1
31,5
/0,1
31,5
/0,1
50/0,1 10/0,5
Rated frequency Hz 50
Degree of protection   IP 55
Dimensions:
width [A]
height [B]
depth [C]
mm
mm
mm
800
950 ÷ 1050
350
670
2280
580
650
850 ÷ 950
350
550
850
430
900
2280
700
770
650
645
Internal Arc Classification   BFLR AFLR
Compliance with standards   PN-EN 62271-200; PN-EN 62271-1

Exemplary schematic diagrams

Product card in pdf format MV cable connection boxes types SZK, SZPO-6 plik .pdf

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