Eaton SVS/12, User Manual

Page: 104 / 138

SVS/12
104 994.530 G01 02
4.3.4 Three-pole short-circuit-proof back-up
earth, 630 A and 1250 A panels
Required accessories
For fitting a three-pole back-up earth on the 17.5 kV cable
entry port, a bag of earthing equipment can be supplied
(figure 1), consisting of:

one unit with three earth contacts and two built-in
interlocks with keys

one earthing cable (70 mm
2
) with connecting clamp
For technical data, see chapter 7.
Interlocks
Access to the 17.5 kV cable entry port is only possible if
the cable is earthed by means of the integrated earthing of
the load-break switch or circuit-breaker panel. However,
this is not possible on a panel with a direct busbar
connection.
I
NSTALLATION OF THE THREE
-
POLE BACK
-
UP EARTH
L
IFE HAZARD
!
When earthing the cable via the 17.5 kV cable
terminal block in combination with a direct
busbar connection, the shutter is secured in
front of the cable entry ports. The contacts
behind this shutter are directly connected to the
main busbar system of the installation. This
requires extra safety measures..
1. Earth the cable via the integrated earthing of the load-
break switch or circuit-breaker (see chapter 4.3.1).
2. Open the relevant protection cover by turning the key a
quarter turn counterclockwise and remove the panel.
N
OTE
The shutter can only be opened if the
disconnector is in the earthing position and the
circuit-breaker or load-break switch is closed.
3. Connect the earthing cable to the earth busbar using
the connecting clamp (figure 2).
1.
2.