5.5 Apparatus using capillaries
The capillaries shall either comply with the gap dimensions given in Table 1 or Table 2 for
cylindrical joints using 0 as the diameter of the inner part, or when the capillaries do not
conform to the gaps given in these tables, the apparatus shall be evaluated in accordance with
the test for non-transmission of an internal ignition given in 15.2.
6 Cemented joints
6.1 General
Parts of a flameproof enclosure may be cemented either directly into the wall of the enclosure
so as to form with the latter an inseparable assembly, or into a metallic frame such that the
assembly can be replaced as a unit without damaging the cement.
If a joint which is cemented does not fulfil the requirements of Clause 5, in the absence of the
cement it shall be subjected to 23.4.7.3 and 23.4.7.4 of IEC 60079-0.
6.2 Mechanical strength
Cemented joints are only permitted to ensure the sealing of the flameproof enclosure of which
they form a part. Arrangements shall be made in the construction so that the mechanical
strength of the assembly does not depend upon the adhesion of the cement alone. Cemented
joints shall comply with a test based on Annex C with the relevant overpressure value given in
15.1.3.
6.3 Width of cemented joints
The shortest path through a cemented joint from the inside to the outside of a flameproof
enclosure of volume V shall be