Earthing A Protected Panel - Eaton Magnefix MD4 User Manual

Magnefix MD4
4.7.6

Earthing a protected panel

W
ARNING
•
Do not fit an earthing cap unless it is dead.
•
If an earthing cap is fitted to a live cast resin
insulated member, a short-circuit current may
cause the earthing cap to jump away, followed
by an electric arc extending in the direction of
the operator. Eliminate this risk by switching on
each earthing cap with a rapid and sharp
movement. Therefore, first of all read the safety
instructions in para 4.1.1 on switching the
switch caps on and off.
•
When fitting the earthing caps, never put your
hand between the red ring on the mounting rod
and the earthing caps.
The vacuum circuit-breaker must be switched on prior to
the earthing of the protected panel.
Switching on for cable earthing
It is assumed that the switch caps of the corresponding
branch-circuit panel have been removed. If the electric trip
indicator (10) shows a red field, the fault requires to be
repaired first before the protective relay can be reset. The
red field of the trip indicator will then change to black.
1. Satisfy yourself that the switchgear is safe to be
switched on.
2. The electric trip indicator (9) must show a black field.
3. Move the release knob (1) upwards and satisfy
yourself that the guard (2) opens.
4. Place the switch-on lever (3) in the lip (4).
5. Move the switch-on lever (3) upwards.
6. Satisfy yourself that the position indicator (5) changes
from the OFF-position (white) to the ON-position
(black).
7. Move the switch-on lever (3) downwards and take it
out.
8. Place the earthing interlock locking knob (7) in the trip
button housing (6).
9. Turn the key (8) to the left and remove it.
The key must be retained by the person performing the
switching operations!
92 991.184 G01 03
Earthing using earthing cables
2.
Earthing interlock locking knob