The Indicators; Earthing; Switchgear Safety; Switchgear Operation - Eaton Magnefix MD4 User Manual

2.1.9

The indicators

The overcurrent indicator.
The switch caps may have an overcurrent indicator at the
front.
Working either electromechanically or electronically, the
overcurrent indicator is fitted under the protection cap of
the switch cap.
R
EMARK
Fitted with an electronic overcurrent indicator, the
switch cap is 21 mm higher than a switch cap with
an electromechanical overcurrent indicator.
There is a small window in the protection cap.
If the current passing the switch cap exceeds a preset
value, a red flag is displayed in the window. As soon as the
overcurrent situation ceases to exist, the electromechanical
overcurrent indicator can be reset using a magnet.
The electronic version has a self-resetting function.
The position indicator
The protected panel has a position indicator at the front (in
the panel diagram). This position indicator operates
mechanically.
If the position indicator is black, the vacuum circuit-breaker
is switched on.
If the position indicator is white, the vacuum circuit-breaker
is switched off.

2.1.10 Earthing

General
Magnefix switchgear can be earthed via the cable and the
transformer. It is not possible to earth the busbar system.
Cable earthing
The earthing system for the cable consists of a set of three
earthing caps fitted where the switch caps are located, in
the cable panel to be earthed.
Transformer earthing
The earthing system for the transformer consists of a set of
three earthing pins fitted in the corresponding fuse panel.
The earthing caps or pins are connected to the earthing
point of the switchgear using a bolted connection and
special earthing cables.
Earthing of the protected panel
The earthing system for the protected panel consists of a
set of three earthing caps fitted where the switch caps are
located, in the corresponding branch-circuit panel. In order
to start with the standard earthing procedure, the vacuum
circuit-breaker must be switched on and interlocked using a
key.

2.2 Switchgear safety

This paragraph contains a description of the safety
provisions on the Magnefix switchgear and directions on
how to deal with them.
2.2.1

Switchgear operation

Competence
The equipment must only be operated by skilled personnel
and specialist operators.
Actions not described in this manual.
Operating or maintenance actions not described in this
manual may be required:

Actions which are specific to your installation are
described in the operating instructions supplied with it.
See information pack which includes this manual.

Actions which are not described at all may only be
carried out in consultation with an Eaton specialist.
The instructions of this specialist must be followed
exactly.
Special safety measures
In general it will not be necessary to take special safety
precautions when operating the switchgear. It is advisable,
however, to wear suitable ear protection for repeated
switching.
When carrying out work, please observe the following:

Cover open switches (on panels completely or partly
switched off) with protective covers. A protective cover
must be fitted immediately after switching off and it
must not be removed again until just before switching
on.

Always protect cable connection points that are not
used with a dummy cable box.
Magnefix MD4
991.184 G01 03 13