Universal single phase - three phase earthing device - universal clamps CCRU or CCNU type


Category:

    

Code:Msp – CCRU – Sp/lp – S/O/P/p     Msp – CCRU – 3xSf/lf – Sp/lp – S/O/P/p
           Msp – CCNU – Sp/lp – S/O/P/p     Msp – CCNU – 3xSf/lf – Sp/lp – S/O/P/p

The universal single phase or three phase earthing device applicable on rectangular conductors (bus bars, platband), round conductors (flexible multicore conductors, rigid bars or “T” fixed points) and spherical pieces can be provided with one of the following phase clamps:

– Universal classic reduced phase clamp, CCRU type (casting from aluminium alloy);
– Universal classic normal phase clamp, CCNU type (casting from aluminium alloy).

Both phase clamps have a fixing system on the conductor, consisting of a mobile die operated by a tightening screw. This screw is provided – to its extremity – with a coupling system which allows a quick and safe connection at the insulating stick. The coupling system can be bayonet type (RO), bayonet type (DIN), hexagonal.

The earthing clamp can be classic (standard model) or with scrapping die (optional model), adapted to the short-circuiting current of the earthing device.
In single-phased construction, the earthing cable length varies between 6 and 8 meters, depending on the poaition where it is mounted the phase clamp.
In three-phased construction, the length of the short-circuiting cable (measured between the phase clamp and the connection point) varies usually between 1 and 2 meters, the length of the earthing cable (measured between the connection point and the earthing clamp) varies usually between 2 and 4 meters, depending on the poaition where it is mounted the phase clamp.
The cross-section of the earthing cable should by chosen depending on the required short-circuiting current.

This equipment is delivered in sets of three single-phased earthign devices or as a three-phased short-circuiting device, in a carrying bag or a transport case.

 

General characteristics for the earthing devices equipped with universal phase clamps

Earthing cable section Sp (mm2)

16

25

35

50

70

95

120

Nominal short-circuiting current for t = 1s Isc (kA)

4

6,25

8,75

12,5

17,5

23,75

30

Nominal peak current for t = 0,02 s Isd (kA)

10

15,63

21,9

31,25

43,75

59,38

75

Testing short-circuiting current for t = 1s Itest (kA)

4,6

7,2

10,6

14,38

20,13

27,31

34,5

Testing peak current for t = 0,02 s Ipeak (kA)

11,5

17,97

25,16

35,94

50,13

68,3

86,25

Peak factor (SR EN 61230)

 2,5

.

Phase clamp type

Universal classic reduced phase clamp (CCRU) Universal classic normal phase clamp (CCNU)

Short-circuiting cables length – three-phase earthing device lf (m)

max. 2,5

max. 2,5

Earthing cable length – single phase earthing device /
three phase earthing device lp (m)

max. 10 / max. 7,5

max. 10 / max. 7,5

Thickness of rectangular conductor on which can be mounted the phase clamp g (mm)

max. 30

max. 45

Diameter of coupling piece spherical type (mm)

20 / 25

20 / 25

Diameter of conductor on which it can be applied the phase clamp øD (mm)

4 ÷ 30

4 ÷ 36