<4.
Wiring and Piping
>
4-2
IM 21B03D01-01E
4.2.2 Wiring
(1) Install wiring away from noise sources such as
a large capacity transformer, motor, or power
supply.
(2) Remove terminal box cover and wiring
connection dustproof plugs, then connect
wiring.
Using an Allen wrench (width 3mm), unscrew
the locking setscrew and remove the flameproof
cover.
Then, connect the wiring and when installing
the cover, do not neglect to fasten shrouding
metal.
(3) It is recommended that clip-on terminals R1.25-
5 or R2-5 be used for wiring termination (JIS C
2805).
(4) It is also recommended that wiring be installed
in conduits and ducts to provide protection
against water or external damage. For
flameproof external wiring, see 1.6 Installation
of Flameproof Type” and “Installation and
Operating Precautions for TIIS Flameproof
Equipment” at the end of this manual.
(5) When installing a flameproof gland packing
adapter (option code: /G11 and /G21) for cable
wiring, observe the following steps.
a. Release the shrouding metal and remove the
terminal box cover.
b. Measure the outside dia. of the cables to be
used in two directions in 0.1mm unit.
c. Obtain the average value of the measured
values in two directions and select a gland
packing whose inner dia. is nearest to the
average value from among those in Table
4.1.
d. Screw the flameproof packing adapter into
the terminal box until the O-ring touches the
terminal box wiring port (at least 6 full turns),
and tighten the lock nut.
e. Insert the cable through the union cover, the
union coupling, the clamp nut, the clamp ring,
the gland, one washer, the rubber packing,
and the packing box, in that order.
f. Insert the end of the cable into the terminal
box.
g. Tighten the gland 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.
CAUTION
Tighten the gland approximately one turn after
the point where you can no longer shift the cable
up and down by hand.
Take great care in this step, since proper
tightening is very important.
h. Fasten the cable with tightening the clamp
nut.
i. Tighten the lock nut on the union cover.
j. Connect the cable wires to each terminal.
Table 4.2
Type of Packing and Applicable Cable
O.D.
Wiring
port
thread
diameter
Appropriate
cable outer
diameter
(mm)
Identifying
mark
Part
Number
G1/2
8-10
10.1-12
16
16
8-10
10-12
G9601AM
G3/4
10-12
12.1-14
14.1-16
22
22
22
10-12
12-14
14-16
G9601AN
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