13.2 Conduit sealing devices
Conduit sealing devices, whether integral or separate, shall meet the requirements of this
standard, the requirements of C.2.1.2 and C.3.1.2 with "conduit sealing device" substituted for
"cable gland" and create, on the enclosure, the joint widths and gaps prescribed in Clause 5.
NOTE As such constructions preclude reuse, the requirement of C.2.1.2 that a conduit sealing device be capable
of being fitted and removed without disturbing the compound seal after the specified curing period of the compound
should not apply.
Where conduit sealing devices are integral with the enclosure or specific to the enclosure they
shall be tested as part of the enclosure concerned.
Where conduit sealing devices are separate:
– threaded Ex conduit sealing devices can be evaluated as apparatus. Such conduit sealing
devices do not have to be submitted to the tests of 15.1, nor to the routine test of Clause 16;
– other conduit sealing devices can only be evaluated as an Ex component.
13.2.1 Conduit entries are permitted only for electrical apparatus of Group II.
13.2.2 A sealing device such as a stopping box with setting compound shall be provided,
either as part of the flameproof enclosure or immediately at the entrance thereto. It shall satisfy
the type test for sealing prescribed in Annex C. An evaluated sealing device may be applied by
the installer or user of the apparatus according to instructions provided by the manufacturer of
the apparatus.
NOTE A sealing device is considered as fitted immediately at the entrance of the flameproof enclosure when the
device is fixed to the enclosure either directly or through an accessory necessary for coupling.
The sealing compound(s) and method(s) of application shall be specified in the certificate
either of the stopping box or of the complete flameproof apparatus. The part of the stopping
box between the sealing compound and the flameproof enclosure shall be treated as a
flameproof enclosure, i.e. the joints shall comply with Clause 5 and the assembly shall be
submitted to the tests for non-transmission of 15.2.
The distance from the face of the seal closest to the enclosure (or intended end-use
enclosure), and the outside wall of the enclosure (or intended end-use enclosure) shall be as
small as practical, but in no case more than the size of the conduit or 50 mm, whichever is the
lesser.
13.3 Plugs and sockets and cable couplers
13.3.1 Plugs and sockets shall be constructed and mounted so that they do not alter the
flameproof properties of the enclosure on which they are mounted, even when the two parts of
the plugs and sockets are separated.
13.3.2 The widths and the gaps of the flameproof joints (see Clause 5) of the flameproof
enclosures of plugs and sockets and cable couplers shall be determined by the volume which
exists at the moment of separation of the contacts other than those for earthing or bonding or
those which are parts of circuits complying with IEC 60079-11.
13.3.3 For plugs and sockets and cable couplers, the flameproof properties of the enclosure
shall be maintained in the event of an internal explosion, both when the plugs and sockets or
cable couplers are connected together and at the moment of separation of the contacts, other
than those for earthing or bonding or those which are parts of circuits complying with
IEC 60079-11.