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Manual PTB 24 ATEX 1001 X
If other terminals are installed, the appropriate
torques and cable cross sections must be ascer-
tained from the supplier's installation instruc-
tions.
The terminals used for circuits with increased
safety 'e' protection must be arranged so that the
creepage distances and clearances called for by
EN IEC 60079-7 for the operating voltage con-
cerned are met.
In order to ensure an orderly arrangement of the
conductors and secure connection of the con-
ductors to the installed terminal blocks and com-
ponents, a minimum clearance between the
enclosure interior wall and these components or
between two components must be maintained.
This clearance is dependent on the cross section
of the conductors, as indicated in Table 2.
No. of single- or multicore conductors
Minimum distances of terminals blocks
Conductor
cross
1 conductor
section
2
[mm
]
1.5
20 mm
2.5
20 mm
4
20 mm
6
20 mm
Table 2:
Minimum clearance between terminal blocks
and enclosure wall as a function of the num-
ber of conductors entering the enclosure
The conductor must be connected particularly
carefully in order to maintain the integrity of the
type of explosion protection.
The insulation must continue as far as the termi-
nal, and the conductor itself must not be dam-
aged.
The minimum and maximum cross sections of
conductor that can be connected must be taken
into account (see Section Technical data).
All screws and/or nuts on the terminals, including
those that are not in use, must be securely tight-
ened. Applying excess torque, however, can
damage the connection.
Edition April 2024
Copyright
brought in
from wall in the case of
2 conductors
3 or more
conductors or
2 side by side
20 mm
20 mm
20 mm
20 mm
20 mm
25 mm
25 mm
30 mm
17
thuba Ltd., CH-4002 Basel
Switzerland
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