You should firstly disassembly the explosion cable gland to sub assembly A(close to enclosure) and sub assembly B(close to cable), sub assembly C(middle detachable armor cone) if the cable is armored type, then secondly fix the sub assembly A into the enclosure thread hole, thirdly strip the outer sheath of cable and expose the armor layer, then pass the stripped cable into the sub assembly B, then fix the armored layer with sub assembly C into the sub assembly A and push forward the cable into the enclosure, finally hold all parts tightly using a spanner.