(2) Flameproof Metal Conduit Wiring
• For the flameproof metal conduit wiring or insulated wires shall be used as recommended by the USER’S GUIDELINES for Electrical Installations for Explosive Gas Atmospheres in General Industry, published in 1994.
• For conduit pipes, heavy-gauge steel conduits conforming to JIS C 8305 Standard shall be used.
• Flameproof sealing fittings shall be used in the vicinity of the wiring connections, and those fittings shall be filled with sealing compounds to complete sealing of the apparatus. In addition, to prevent explosive gases, moisture, or flame caused by explosion form being propagated through the conduit, always provide sealing fittings to complete sealing of the conduit in the following locations:
(a) In the boundaries between the hazardous and nonhazardous locations.
(b) In the boundaries where there is a different classification of hazardous location.
• For the connections of the apparatus with a conduit pipe or its associated accessories, G-type parallel pipe threads (JIS B 0202) shall be used to provide a minimum of five-thread engagement to complete tightness. In addition, since these parallel threads do not have sealing property, non hardening sealant such as liquid gaskets shall thus be applied to those threads for ensuring waterproofness.
• If metal conduits need flexibility, use flameproof flexible fittings.
(2) Flameproof Metal Conduit Wiring
• For the flameproof metal conduit wiring or insulated wires shall be used as recommended by the USER’S GUIDELINES for Electrical Installations for Explosive Gas Atmospheres in General Industry, published in 1994.
• For conduit pipes, heavy-gauge steel conduits conforming to JIS C 8305 Standard shall be used.
• Flameproof sealing fittings shall be used in the vicinity of the wiring connections, and those fittings shall be filled with sealing compounds to complete sealing of the apparatus. In addition, to prevent explosive gases, moisture, or flame caused by explosion form being propagated through the conduit, always provide sealing fittings to complete sealing of the conduit in the following locations:
(a) In the boundaries between the hazardous and nonhazardous locations.
(b) In the boundaries where there is a different classification of hazardous location.
• For the connections of the apparatus with a conduit pipe or its associated accessories, G-type parallel pipe threads (JIS B 0202) shall be used to provide a minimum of five-thread engagement to complete tightness. In addition, since these parallel threads do not have sealing property, non hardening sealant such as liquid gaskets shall thus be applied to those threads for ensuring waterproofness.
• If metal conduits need flexibility, use flameproof flexible fittings.
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