2
EX-B03E
INSTALLATION AND OPERATING PRECAUTIONS FOR TIIS FLAMEPROOF EQUIPMENT
4. Installation of Flameproof Ap-
paratus
(1) Installation Area
Flameproof apparatus may be installed, in accordance with
applicable gases, in a hazardous area in Zone 1 or 2, where
the specified gases are present. Those apparatus 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: An area in which an explosive gas atmosphere is
present continuously or is present for long periods.
Zone 1: An area in which an explosive gas atmosphere is
likely to occur in normal operation.
Zone 2: An area in which an explosive gas atmosphere is not
likely to occur in normal operation and if it does
occur it will exist for a short period only.
(2) Environmental Conditions
The standard environmental condition for the installation of
flameproof apparatus is limited to an ambient temperature
range from –20
°
C to +40
°
C (for products certified under
Technical Criteria). However, some field-mounted
instruments may be certified at an ambient temperature up to
+60
°
C as indicated on the instrument nameplates. If the
flameproof apparatus are exposed to direct sunshine or
radiant heat from plant facilities, appropriate thermal
protection measures shall be taken.
5. External Wiring for Flameproof
Apparatus
Flameproof apparatus require 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, see the “USER’S GUIDE-
LINES for Electrical Installations for Explosive Gas
Atmospheres in General Industry,” published in 1994.
(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-type parallel pipe threads (JIS B 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 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 is made, a flame-
proof 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.