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Yokogawa UYF200 Ultrasonic Vortex Flowmeter Manual

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EX-B01E 3
IM 1F5B2-01E
INSTALLATION AND OPERATING PRECAUTIONS FOR JIS FLAMEPROOF EQUIPMENT
(1) Cable Wiring
* For cable wiring, cable glands (cable entry devices for flameproof type) specified or
supplied with the apparatus shall be directly attached to the wiring connections to
complete sealing of the apparatus.
* Screws that connect cable glands to the apparatus are those for G- or PF-type parallel
pipe threads (JIS C 0202) with no sealing property. To protect the apparatus from
corrosive gases or moisture, apply nonhardening sealant such as liquid gaskets to
those threads for waterproofing.
* Specific cables (conforming to JIS C 3401) shall be used as recommended by the
“USER’S GUIDELINES for Electrical Installations for Explosive Gas Atmospheres in
General Industry,” published in 1994.
* If 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 from 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 bound-
aries, 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.
(2) Flameproof Metal Conduit Wiring
* For the flameproof metal conduit wiring, 600-V PVC insulated wires (JIS C 3307) 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 from 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- or PF-type parallel pipe threads (JIS C 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.
… 82


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