Yokogawa EJA118 - Manual (Page 24)

IM 1C22H1-01E 5-3
5. WIRING
5.4.2 Wiring Installation
(1) General-use Type and Intrinsically Safe
Type
Make cable wiring using metallic conduit or water-
proof glands.
• Apply a non-hardening sealant to the terminal box
connection port and to the threads on the flexible
metal conduit for waterproofing.
F0507.EPS
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
Figure 5.4.2a Typical Wiring Using Flexible Metal Conduit
(2) Flameproof Type (JIS)
Wire cables through a flameproof packing adapter, or
using a flameproof metal conduit.
᭿ Wiring cable through flameproof packing adapter
for only JIS flameproof type (see Figure 5.4.2b).
• Use only flameproof packing adapters approved by
Yokogawa.
• Apply a nonhardening sealant to the terminal box
connection port and to the threads on the flameproof
packing adapter for waterproofing.
Flameproof packing adapter
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
F0508.EPS
Figure 5.4.2b Typical Cable Wiring Using Flameproof
Packing Adapter
• Measure the cable outer diameter in two directions to
within 1 mm.
• Calculate the average of the two diameters, and use
packing with an internal diameter nearest to this value
(see Table 5.4.2).
Table 5.4.2 Flameproof Packings and Applicable Cable
Outer Diameters
T0501.EPS
G9601AM
8 to 10
10.1 to 12
16 8-10
16 10-12
G 1/2
G11
G12
Optional
Code
Wiring Port
Thread
Diameter
Applicable
Cable OD
(mm)
Identifying
Mark
Part
Number
• Mounting flameproof packing adapter body to conduit
connection (see Figure 5.4.2c)
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.
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.
F0509.EPS
Figure 5.4.2c Installing Flameproof Packing Adapter