thuba SAnR Manuel page 19

Manual BVS 20 ATEX E 103 X / BVS 20 ATEX E 104 X
fitted with CEAG type GHG 960 923 P... cable
glands. The dimensions, the clamping ranges for
cables and wires and the torques are shown in
the tables in Annex A (page 24) .
If other cable and conductor entries are in stalled,
the required torques and cable diameters will be
found in the appropriate manual.
Intrinsically safe circuits must enter and leave
the enclosure via separate cable entries that are
specially marked (for example with a light blue
color).
If any cable and conductor entries are not used
or are no longer needed, the tapped holes and
redundant gland bodies must be blanked off with
suitable blind plugs or caps.
4.4 Equipotential bonding and
PE conductor
From the standpoint of intrinsic safety Ex i, a dis-
tinction must be made between the equipotential
bonding conductors and the PE conductors in
the installation. The bonding conductor is regard-
ed as a passive conducting element that fulfills
the required separation conditions with a 500 V
insulation test. The PE conductor, however, is at
a certain potential in the event of a fault, and is
regarded as an active, non-intrinsically safe ele-
ment.
4.5 Shielded cables in intrinsically
safe circuits
If a cable shield is brought into a Zone 1 or
Zone 0 hazardous area during installation, it
must either be treated as an equipotential bond-
ing conductor or must meet the requirements of
a recognized type of explosion protection.
Edition February 2021
Copyright
15
thuba Ltd., CH-4002 Basell
Switzerland