Width of joints (L)
The width of joints shall not be less than the minimum values given in Tables 1 and 2. The
width of joints for cylindrical metallic parts press-fitted into the walls of a metallic flameproof
enclosure of a volume not greater than 2 000 cm3 may be reduced to 5 mm, if
– the design does not rely only on an interference fit to prevent the part being displaced
during the type tests of Clause 15, and
– the assembly meets the impact test requirements of IEC 60079-0, taking the worst-case
interference fit tolerances into account, and
– the external diameter of the press-fitted part, where the width of the joint is measured, does
not exceed 60 mm.