Single phase earthing device for subway


Category:

 

Code: Msp – CM – 120/1,5 – S3/ps

The single phase earthing device for subway is provided with a special phase clamp for the 3rd rail (power supply rail) from the subways and manual earthing clamp for rails.

The special phase clamp for connection at the 3rd rail has a body (casting from cooper-aluminium alloy) and a tightening screw. At the end of the screw, there is an actuating ring. The fastening of this clamp could be performed using an insulating stick PMU-20-1-B/ba and a hook-bayonet adaptor mounted in the coupling system of the stick.

The manual earthing clamp (casting from copper-aluminium alloy) is special designed to allow its fastening under the rail, leaving the track free.

Technical characteristics

Earthing cable section Sp (mm2)

120

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

30

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

60

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

34,5

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

69

Peak factor (SR EN 61230)

2

Maximum earthing cable length lp (m)

1,5

Railway type

40, 49, 60, R65

Type of 3rd rail for electric traction

40

The single-phased short-circuiting device is composed of:
–  special phase clamp for connection at the 3rd rail – 1 piece;
–  earthing cable – 1 piece;
–  manual earthing clamp for rails – 1 piece;
–  hook-bayonet adapter – 1 piece.

The short-circuiting device is delivered in a transport bag/box.