10
6 Installation
For the mounting and operation, the
respective national regulations as well as
the general rules of engineering shall be
observed (IEC/EN 60079-14).
X
ATEX - IEC
When mounting the separately certified
terminals, the clearance an creepage distance
must be observed in accordance to table 1 of
IEC/EN 60079-7.
6.1 Mounting
The plastic boxes can be mounted without
opening their enclosure.
When mounting the terminal boxes directly
onto the wall, they shall rest evenly only on the
fastening points provided for them. The chosen
screw must match the fastening hole (see
dimensional drawings page 8) and they shall
not damage the hole (e.g. use of a washer).
The terminal boxes must be fastened diagonally
by means of at least 2 screws.
If the screws are overtightened, the
plastic terminal boxes may be damaged.
The plastic terminal boxes GHG 721 0 and
GHG 721 0 are suitable for fastening onto CCH/
EATON apparatus holders by means
of self-cutting screws and clip-on mounting
(see fig. 4 - 7, page 11 + 12).
The respective mounting instructions
will have to be observed.
6.2 Opening the apparatus/
Electrical connection
a
The electrical connection of the
apparatus may only be carried out by
skilled staff (IEC/EN 60079-14).
The minimum clearances and creepage
distances in accordance with IEC/EN 60079-7,
Table 1, shall be observed.
The table indicating the current load values
which is provided on the cover inside of the
terminal boxes is to be observed.
In order to maintain the mode of protection, the
conductors will have to be connected with
special care.
The insulation shall reach up to the
terminal. The conductor itself shall not
be damaged.
The connectable min. and max. conductor
cross-sections will have to be observed.
All screws and/or nuts of the supply terminals,
and unused terminals, shall be tightened down.
The fitted standard terminals are designed for
direct connection of conductors with copper
cores.
If stud terminals are fitted, DIN cable lugs shall
be used.
The cable lugs should be crimped onto
the cable in a workmanlike manner. It is to
be ensured that the required min. air gaps
are kept (at 690V ->12mm).
When combining Ex-e/Ex-i it is essential to
maintain the separation, air and creepage
distances. The Ex-i circuit wires are to be laid
separately from the Ex-e circuit wires
(see e.g. EN/IEC 60079-11).
The connection wires of the Ex-i circuits are
to be marked (e.g. by colour, light blue).
After removing the terminal rail (in order to
facilitate the entry of cables), the terminal rail
shall again be properly put in place before
establishing the electrical connection.
Removal and mounting of the terminal rail are
performed as follows:
By pressing apart the enclosure sides, the
terminal rail can be detached from the bottom
part of the enclosure.
In order to install the terminal rail, it is fitted
onto the catch on one side of the enclosure wall
and then snapped in on the opposite enclosure
wall (see fig. 3).
The PE rail can optionally be fitted in 4 positions
(see fig.1):
A Enclosure top side
- PE-connection bottom
B Enclosure top side
- PE-connection top
C Enclosure bottom side - PE-connection bottom
D Enclosure bottom side - PE-connection top
The PE rail is fitted as follows: It has to be
pushed home in the respective guide rails that
are integrated into the lateral enclosure walls.
The rail must engage into the receptacle
on the bottom of the housing. Care has to
be taken that the PE rail has such a position
that a proper conductor connection is
ensured.
In the case of building up the electrical
equipment in the "protective insulation" version,
appropriate sticker GHG 905 1002 P0005 can
be requested by the manufacturer.
If the inserted terminal rail is not equipped
completely with line-up terminals, the terminal
rail must be included in the equipotential earth
connection also.
Fig. 1
Fig. 2
Fig. 3
A
B
C
D
1
2
Explosion protected terminal boxes type, GHG 72.
GB
