Single phase earthing device for bus bars

Single phase earthing device for bus bars


Category:

    

Code: Msp – C – Sp/lp – P/p
           Msp – CCU – Sp/lp – S/O/P/p 
Msp – CA – Sp/lp – P/p
            Msp – CAE – Sp/lp – P/p 
Msp – CAU – Sp/lp – S/O/P/p  

The single phase earthing device for bus bars (rectangular conductors, flat bars) can be provided with one of the following phase clamps:
Classic phase clamp, C type (casting from aluminium alloy);
Universal classic phase clamp, CCU type (extrusion of aluminium alloy);
Automatic phase clamp, CA type (casting from aluminium alloy);
Automatic extruded phase clamp, CAE type (extrusion of aluminium alloy);
Universal automatic phase clamp, CAU type (extrusion of aluminium alloy).

All types of phase clamps have a fixing system on the bar, consisting of a mobile die operated by a tightening screw. This screw is provided – to its extremity – with a bayonet coupling system which allows a quick and safe connection at the insulating stick. The automatic phase clamps are additionally provided with a special system which allows a preliminary fastening of the clamp on bar (by acting the mobile die). This preliminary fastening is triggered by a lightly knocking of the clamp by bar and must be followed by a firm fastening obtained by screwing.

The earthing clamp can be
classic (standard models) or with scrapping die (optional models), adapted to the short-circuiting current of the earthing device. The length of the earthing cable should be chosen depending on the positions of application points for phase clamp and earthing 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 pieces, in a carrying bag or a transport case.

 

 

General characteristics for earthing devices for bus bars

Earthing cable section Sp (mm2)

16

25

35

50

70

95

120

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

C / CA / CAE

3,5

6

8

12

16

20

30

CCU / CAU

4

6,25

8,75

12,5

16

23,75

30

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

Isd = 2,5 x Isc

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

Itest = 1,15 x Isc

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

Ipeak = 1,15 x Isd

Peak factor (SR EN 61230)

2,5

.

Phase clamp type

Classic clamp (C)Universal classic clamp (CCU)Automatic clamp (CA)Automatic extruded clamp (CAE)Universal automatic clamp (CAU)

Earthing cable length lp (m)

max. 8,5

max. 10

max. 8,5

max. 8,5

max. 10

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

max. 40

max. 40

max. 37

max. 36

max. 37

Diameter of coupling piece spherical type (mm)

30

30

 

The single phase earthing device is composed of:
– Phase clamp – 1 piece
– Earthing cable  – 1 piece
– Earthing clamp – 1 piece