GE FVP110 Maintenance Manual page 284

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corrosive gases or moisture, apply nonhardening sealant such as liquid gaskets to
those threads for waterproofing.
❑
Specific cables shall be used as recommended by the "USER'S GUIDELINES for
Electrical Installations for Explosive Gas Atmospheres in General Industry,"
published in 1994.
❑
In necessary, appropriate protective pipes (conduit or flexible pipes), ducts or trays
shall be used for preventing the cable run (outside the cable glands) from damage.
❑
To prevent explosive atmosphere from being propagated form Zone 1 or 2
hazardous location to any different location or non-hazardous location through the
protective pipe or duct, apply sealing of the protective pipes in the vicinity of
individual boundaries, or fill the ducts with sand appropriately.
❑
When branch connections of cables, or cable connections with insulated cables
inside the conduit pipes are made, a flameproof or increased-safety connection
box shall be used.
In this case, flameproof or increased-safety cable glands meeting the type of
connection box must be used for cable connections to the box.
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 non-hazardous 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, nonhardening sealant such as liquid
gaskets shall thus be applied to those threads for ensuring waterproofness.
❑
If metal conduits need flexibility, use flameproof flexible fittings.
FVP 110 Fieldbus Valve Positioner Manual
268