Yokogawa YVP110 - Manual (Page 33)

<4. Wiring and Piping>
4-4
IM 21B04C01-01E
1) Screw the flameproof packing adapter into the
terminal box until the O-ring touches the wiring
port (at least 6 full turns), and firmly tighten the
lock nut.
2) Insert the cable through the union cover, the
union coupling, the clamp nut, the clamp ring,
the gland, the washer, the rubber packing, and
the packing box, in that order.
3) Insert the end of the cable into the terminal box.
4) Tighten the union cover to grip the cable.
When tightening the union cover, tighten
approximately one turn past the point where the
cable will no longer move up and down.
IMPORTANT
Proper tightening is important. If it is too tight, a
circuit break in the cable may occur; if not tight
enough, the flameproof effectiveness will be
compromised.
5) Fasten the cable by tightening the clamp nut.
6) Tighten the lock nut on the union cover.
7) Connect the cable wires to each terminal.
O-ring
Adapter body
Lock nut
Wrench
Packing box
Rubber packing
Washer
Gland
Clamp ring
Clamp nut
Union coupling
Lock nut
Wrench
Union cover
Cable
Apply a non-hardnening
sealant to the threads for
waterproofing.
F0405.ai
Figure 4.5 Installing Flameproof Packing Adapter
 Flameproof metal conduit wiring
• A seal fitting must be installed near the
terminal box connection port for a sealed
construction.
• Apply a non-hardening sealant to the
threads of the terminal box connection port,
flexible metal conduit and seal fitting for
waterproofing.
F0406.ai
Non-hazardous area
Hazardous area
Flameproof
heavy-gauge
steel conduit
Tee
Drain plug
Seal fitting
Gas sealing device
Flameproof flexible
metal conduit
Apply a non-hardening
sealant to the threads of
these fittings for
waterproofing
After wiring, impregnate the fitting
with a compound to seal tubing.
Figure 4.6 Typical Wiring Using Flameproof Metal
Conduit
4.4 Grounding
Grounding is always required for the proper
operation of transmitters. Follow the domestic
electrical requirements as regulated in each
country.
Ground terminals are located on the inside and
outside of the terminal box. Either of these terminals
may be used. See Figure 4.2.
WARNING
For JIS flameproof type and intrinsically
safe type, grounding should satisfy Class D
requirements (grounding resistance, 100 Ω or
less).