Operation Manual

5-3
IM 1F5B2-01E
5. WIRING
5.3 Wiring
CAUTION
For JIS Flameproof type:
• Stringent restrictions apply to the wiring materials and methods of flameproof
instruments, including their peripheral devices. Before doing any wiring, ALWAYS
be sure to read “Installation and Operating Precautions for Flameproof Explosion-
Protected Instruments” at the end of this manual.
•Do not open the cover for two minutes after turn-off the power supply.
• In case of the metal conduit wiring, the temperature limit for insulated wire must be
over 75˚C.
■ Follow the procedure below to wire ULTRA YEWFLO.
• For reasons of waterproofing or protection of cables against damage, the use of cable
conduits and ducts is recommended for wiring. (See Figure 5.3-1.)
• To open the cover of a flameproof model of ULTRA YEWFLO, turn the lock screw
clockwise. When you have closed the cover after wiring, ALWAYS turn the lock
screw counterclockwise so the cover is securely fastened.
•Use Yokogawa Electric’s flameproof packings adaptor or conduits for external wiring
of a flameproof model of ULTRA YEWFLO.
Connection box
Thick-wall steel conduit
Tee
Drainage fitting
Flexible
conduit
Figure 5.3-1 Example of Wiring Using Conduits (Standard Model of ULTRA
YEWFLO)