Yokogawa YTA320 - Manual (Page 28)

<5. Wiring>
5-5
IM 01C50B01-01E
Adapter body
Rubber packing
Washer
Packing box
Grand
Clamp ring
Clamp nut
Union coupling
Union cover
O-ring
Lock nut
Lock nut
Cable
Be sure to apply
non-hardening sealant to the
threads for water proofing.
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CAUTION
Figure 5.12 Flameproof Gland Packing Adapter
lnstallation
■ Flameproof metal conduit wiring
• A seal fitting must be installed near the terminal
box connection port for a sealed construction.
• Apply a nonhardening sealant to the threads of
the terminal box connection port, flexible metal
conduit and seal fitting for waterproofing.
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Non-hazardous
area
Hazardous
area
Flameproof
heavy-gauge
steel conduit
Tee
Drain plug
Gas sealing
device
Flameproof flexible
metal conduit
Apply a nonhardening
sealant to the threads of
these fittings for
waterproofing
Seal fitting
After wiring, impregnate the fitting
with a compound to seal tubing.
Figure 5.3 Typical Wiring Using Flameproof Metal
Conduit
5.6 Grounding
Grounding is always required for the proper
operation of transmitters. Follow the domestic
electrical requirements as regulated in each
country. For a transmitter with built-in lightning
protector, grounding should satisfy ground
resistance of 10Ω or less.
Ground terminals are located on the inside and
outside of the terminal box. Either of these terminals
may be used.
WARNING
For TIIS flameproof type and intrinsically safe,
grounding should satisfy Class D requirements
(grounding resistance, 100Ω or less).
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Grounding
terminal
(Inside)
Grounding
terminal
(Outside)
Figure 5.4 Grounding Terminal