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Manual GHG 6.. ....R....
tion on contact assignments and the perti-
nent type examination and should be fol-
lowed to the letter. The control unit is
equipped with the terminals required for
external connection and with additional
components such as control and indicating
devices, measuring instruments, poten-
tiometers, control and selector switches,
flange-mounting receptacles, fuse ele-
ments, miniature breakers, contactors,
motor protection switches, transformers
and temperature controllers.
4.1
Terminals
The number of terminal positions provided for
the protective earth conductors must at least
equal the number of circuits. The maximum
admissible cross-section of the individual earth-
ing conductor terminals as a function of the
maximum admissible cross-section of the asso-
ciated phase and neutral conductor terminals
must at least comply with the figures given in
the following table 1.
Maximum admissible cross-
section of the phase and
neutral conductor terminal
2
S [mm
]
< 16
16 to 35
> 35
Table 1
For neat arrangement of the conductors and
secure connection of the conductors to the ter-
minal blocks (if any), observe the table 2.
In the case of parallel terminal blocks, clear-
ances at least 1.5 times greater than those list-
ed in table 2 must be maintained. For versions
with a mounting plate, where the conductors
cannot be brought in under the terminals, clear-
ances at least 2 times greater than those listed
in table 2 must be maintained between the ter-
minal blocks.
Edition September 2000
Copyright
.
Minimum admissible cross-
section of the associated
earthing conductor terminal
2
Sp [mm
]
S
16
0,5 S
thuba Ltd., CH-4015 Basel
Switzerland
9
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