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Manual BVS 21 ATEX E 069 X
between two components must be maintained.
This clearance is dependent on the cross section
of the conductors, as indicated in Table 1.
If there are parallel rows of terminals, clearances
at least 1.5 times those listed in Table 1 must be
maintained. In the case of versions with a mount-
ing plate, where it is impossible to bring the con-
ductors in under the terminal blocks, at least
twice the clearances given in Table 1 must be
maintained between the terminal blocks.
No. of single- or multicore
conductors brought in
Minimum distances of terminals
blocks from wall in the case of
Conductor
cross
1 conductor
section
2
[mm
]
1.5
20 mm
2.5
20 mm
4
20 mm
6
20 mm
10
25 mm
16
30 mm
25
40 mm
35
50 mm
50
60 mm
70
75 mm
95
100 mm
120
125 mm
150
140 mm
185
150 mm
240
160 mm
Table 1:
Minimum clearance between terminal blocks
and enclosure wall as a function of the num-
ber of conductors entering the enclosure
The clearances stated in Table 1 need not be
maintained in the case of enclosure interior walls
that do not have any cable entries.
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.
Edition October 2021
Copyright
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
30 mm
40 mm
40 mm
50 mm
50 mm
60 mm
60 mm
75 mm
75 mm
100 mm
100 mm
125 mm
125 mm
140 mm
140 mm
150 mm
150 mm
160 mm
160 mm
170 mm
170 mm
180 mm
15
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Switzerland
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