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4-3
Chapter 4 Electrical Wiring
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Piping for Wiring/Cable Gland
Run the cable into the case of the liquid level transmitter as described below.
y
Attach the pipe serving as a conduit or the cable gland to the conduit for electrical
wiring on the bottom left of this device.
y
To prevent rainwater from entering inside this device, use sealant, etc., to waterproof
the conduit connection. Additionally, for the cable gland, select an appropriate cable
gland with guaranteed waterproof and dust-proof performance.
y
To change the direction of the electrical wiring, use a pipe elbow (additional specifica-
tions 1: L00) as required.
Fig. 4-3. Piping for wiring
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Selection of Lead Wire (Between the Power Supply and Junction Box)
To reduce adverse effects from an induced lightning surge or electrical noise, use 2-core
cabling with performance that is equal to or higher than CVVS PVC-insulated PVC sheath
cable (JCS 258A) with 600 V annealed copper tape shielding for control use. The recom-
mended outside dimension and strand cross-sectional area are given in Table 4-1.
Table 4-1.
Cable external dimension Strand cross-sectional area
11.5 mm or less 1.25 to 2 mm
2
If it is absolutely necessary to use a cable or wire without shielding, use a cable composed
of 3 solid wires or 3 stranded wires with performance that is equal to or higher than the
600 V PVC insulated wire (JIS C 3307), and then ground 1 wire at both ends.
Use a crimp type terminal lug with an insulator for the cable terminal. The outside dimen-
sion of the part of the crimp terminal lug that contacts the screw is shown in Table 4-1.
Table 4-2.
Screw used Outside dimension of screwing part
Crimp type terminal lug 3.5 mm-screw 8.9 mm max
In addition, use wires and cables suitable for the ambient atmosphere in terms of resistance
to temperature and damage-causing gases and liquids.
Cable gland Elbow (optional)