Panasonic MINAS A5 Series Operating Instructions Manual page 43

5. Installation
Driver
Relationship between Wire Diameter and Permissible Current
Example: Power supply 3-phase, 200 V, 35 A, ambient temperature 30°C
Determine the fundamental permissible current according to the
cable conductor material (example: stranded copper wire). (For the
purpose of this example, the ampere indicated by
the table right.)
Next, determine the number of conductors. (In this example, the
cable contains 4 conductors (3 + ground).) Determine the applicable
permissible current using the following formula.
Applicable permissible current
=
= 37 x 0.7 x 1.414
.
= . 36.6 (A)
This permissible value is larger than 35 A to be carried though the
cable. Therefore, according to the list of recommended eco-cables,
the cable to be selected for the cable with nominal cross section 3.5
mm is a polyethylene-insulated heat-resistant 4-conductor power
2
<Supplement>
(Max. permissible temp. – ambient temp.) ÷ 30
Caution
used.
where the cable (4-conductor cable in the case of example),
is housed in plastic race/sheath, plastic tube, metal race/
Because the neutral conductor is not counted as a wire, the cur-
Caution
( ) in the table right.
Wire category: 4-conductor polyethylene-insulated power cable with heat-resistant polyethylene sheath
(Standard: EM JIS C 3605) Maximum permissible temperature: 90°C
Conductor
Nominal
Structure Outside
cross
or shape diameter
section
(wires/mm ) (mm)
2
(mm )
2
2 7/0.6
3.5 7/0.8
5.5 7/1.0
8 7/1.2
Circular
14
compression
Circular
22
compression
Circular
38
compression
Circular
60
compression
Circular
100 12.0
compression
Circular
150 14.7
compression
Circular
200 17.0
compression
Caution
Note
ent temperature and current.
change due to e.g. standard revision. Consult cable manufacturers for the latest information.
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Insulation Sheath
thickness thickness
(mm) (mm)
1.8 0.8 1.5
2.4 0.8 1.5
3.0 1.0 1.5
3.6 1.0 1.5
4.4 1.0 1.5
5.5 1.2 1.6
7.3 1.2 1.8
9.3 1.5 2.0
2.0 2.4
2.0 2.6
2.5 2.9
is selected from
No. of wires in a tube
◎
Max.
(Reference) conductor Test
Finish O.D. resistance voltage
(mm) (20°C) (V/1 min.)
(W/km)
12.0 9.42 1500
13.5 5.30 1500
16.0 3.40 1500
17.0 2.36 1500
19.0 1.34 2000
23 0.849 2000
28 0.491 2500
35 0.311 2500
44 0.187 2500
51 0.124 3000
60 0.0933 3000
current
Copper
Stranded conductor
wire
(nominal cross section: mm )
2
(unit: A)
2 to 3.5 (excl.) 27
◇ 3.5 to 5.5 (excl.) 37
5.5 to 8 (excl.) 49
8 to 14 (excl.) 61
14 to 22 (excl.) 88
11 to 30 (excl.) 115
30 to 38 (excl.) 139
38 to 68 (excl.) 162
60 to 100 (excl.) 217
100 to 150 (excl.) 298
150 to 200 (excl.) 395
Coefficient
Up to 3 0.70
4 0.63
5 or 6 0.56
7 to 15 0.49
16 to 40 0.43
41 to 60 0.39
61 or more 0.34
Minimum (Reference)
insulation Approx.
resistance mass
(kg/km)
2500 170
2500 250
2500 360
2000 475
1500 730
1500 1100
1500 1800
1500 2790
1500 4630
1000 6710
1500 8990
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