34.—(1) Equipment shall be so designed and constructed as to prevent ignition sources arising, even in the event of frequently occurring disturbances or equipment operating faults, which normally have to be taken into account.
(2) Equipment parts shall be so designed and constructed that their stated surface temperatures are not exceeded, even in the case of risks arising from abnormal situations anticipated by the manufacturer.
(3) Equipment shall be so designed that the opening of equipment parts which might be sources of ignition is possible only under non-active conditions or via appropriate interlocking systems. Where it is not possible to render equipment non-active, the manufacturer shall affix a warning label to the opening part of the equipment.
35.—(1) Equipment shall be designed and constructed so that ignition of air and dust mixtures is prevented, even in the event of frequently occurring disturbances or equipment operating faults which normally have to be taken into account.
(2) With regard to surface temperatures, sub-paragraph 33(5) applies.
(3) With regard to protection against dust, sub-paragraph 33(3) applies.
(4) With regard to the safe opening of equipment parts, sub-paragraph 34(3) applies.