<INSTALLATION AND OPERATING PRECAUTIONS FOR FLAMEPROOF ENCLOSURE
“d” CERTIFIED UNDER JAPANESE TYPE CERTIFICATION>
2
EX-B05-1EN
4. Installation of Flameproof Equipment
(1) Installation Area
Flameproof equipment may be installed,
in accordance with applicable gases, in a
hazardous area in Zone 1 or 2, where the
specified gases are present. Those equipment
shall not be installed in a hazardous area in
Zone 0.
Note: Hazardous areas are classified in
zones based upon the frequency of
the appearance and the duration of an
explosive gas atmosphere as follows:
Zone 0: Place in which an explosive
atmosphere consisting of a mixture with
air of flammable substances in the form
of gas or vapour is present continuously
or for long periods or frequently.
Zone 1: Place in which an explosive
atmosphere consisting of a mixture with
air of flammable substances in the form
of gas or vapour is likely to occur in
normal operation occasionally.
Zone 2: Place in which an explosive
atmosphere consisting of a mixture with
air of flammable substances in the form
of gas or vapour is not likely to occur in
normal operation but, if it does occur,
will persist for a short period only.
(2) Environmental Conditions
To comply with the ambient temperature
range which indicated on the nameplate. If the
flameproof equipment are exposed to direct
sunshine or radiant heat from plant facilities,
appropriate thermal protection measures shall
be taken.
5. External Wiring for Flameproof
Equipment
Flameproof equipment requires cable wiring for
their electrical connections. For cable wiring, cable
glands (cable entry devices for flameproof type) to
wiring connections shall be attached. All non-live
metal parts such as the enclosure shall be securely
grounded. For details, read USER’S GUIDELINES
for Installations for Explosive Atmospheres in
General Industry.
(1) Cable Wiring
• For cable wiring, Ex cable glands attached
(or supplied) with the electrical equipment
of Flameproof enclosure shall be used and
connected to conduit.
• Specific cables shall be used as recommended
by the USER’S GUIDELINES for Installations
for Explosive Atmospheres in General Industry.
• 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
near the individual boundaries, or fill the ducts
with sand appropriately.
• When branch connections of cables or cable
and conduit wiring is made, a flameproof
connection box shall be used. In this case,
flameproof cable glands meeting the type
of connection box must be used for cable
connections to the box.
IMPORTANT
The electrical equipment of Flameproof
enclosure is certified to be used with the
attached Ex cable gland(s). Therefore, the
attached Ex cable gland(s), Yokogawa-specified
Ex cable gland, shall be used to satisfy this
requirement.
