Wiring - Mitsubishi Electric JR Series Instruction Manual

7. WIRING

(1) Outline of wiring
Wiring work must be done according to the Guide book of electric equipment standards and
Interior wiring code standards by a trained worker using suitable wiring tools. Working with live
wires is dangerous. Always turn the power OFF before starting the work. The outline of the wiring
requirements is shown in Table 5. If the wiring distance is long, the voltage drop will increase. In
this case, wire so that the voltage drop is 2% or less during motor operation.
Table 5 Motor wiring
Min. wire
thickness*1
Output
(kW)
200V
class
0.2 1.6mm
0.4 1.6mm
0.75 1.6mm
1.5 1.6mm
2.2 1.6mm
3.7 2.0mm
5.5 5.5mm 2
7.5 8mm 2
11 14mm 2
15 22mm 2
18.5 38mm 2
22 38mm 2
30 60mm 2
37 100mm 2
(*1) The min. wire thickness applies to the case when three wires are stored in a metallic conduit
(direct-ON start).
(*2) The max. line length is a guide to ensure a 2% or less voltage drop to the terminal when using
the minimum thickness.
(*3) The overcurrent breaker is for wiring. When using a motor breaker for protecting the motor,
select one that matches the motor's rated output.
There are three classes of general motor insulation, Class E, Class B and Class F. If
high-temperature insulation material such as Class F insulation is used, the temperature in the
terminal box will be relatively high. Thus, use wiring cables and insulation tape that have a high
temperature resistance. (Refer to Table 6.)
Thermal
class of
Insulation wiring
motor
Vinyl insulated wire
Rubber insulated wire
120 (E)
Class 2 vinyl insulated
wire
Polyethylene insulated
wire
Ethylene propylene
130 (B)
rubber insulated wire
Bridged polyethylene
insulated wire
Bridged polyethylene
insulated wire
155 (F)
Silicon rubber insulated
glass mesh wire
Remarks : The tolerable max. temperature indicates the main examples for each material. Some products
may tolerate a higher temperature. Consult the maker for details.
Max. line
length*2
400V 200V 400V
class class class
1.6mm 144m 580m
1.6mm 81m 326m
1.6mm 54m 217m
1.6mm 32m 130m
1.6mm 23m 94m
1.6mm 23m 60m
1.6mm 27m 40m
2.0mm 31m 48m
5.5mm 2 37m 57m
8mm 2 43m 65m
14mm 2 61m 93m
22mm 2 51m 124m
22mm 2 62m 92m
38mm 2 86m 126m
Table 6 Examples of motor wiring materials
Tolerable
max.
temp.
°C
60
60
75
75
80
90
90
180
Overcurrent breaker (A)*3
Using starter
Direct-ON start
(Star-Delta start)
200V 400V 200V
class class class
15 15 -
15 15 -
15 15 -
30 15 -
30 15 -
50 30 -
75 40 40
100 50 50
125 75 75
125 100 100
125 100 125
150 125 125
200 125 175
250 125 225
Wiring material (Example)
Tolerable
Cable
temp.
Vinyl cable
Natural rubber cable
Polyethylene cable
Butyl rubber cable
EP rubber cable
Bridged polyethylene
cable
Bridged polyethylene
cable
Silicon rubber cable
- 7 -
Rated current of
excess scale
ammeter for
motor (A)
400V 200V 400V
class class class
- 5 5 1.6mm
- 5 5 1.6mm
- 5 5 1.6mm
- 10 5 1.6mm
- 10 5 1.6mm
- 15 10 2.0mm
20 30 15 5.5mm
30 30 15 5.5mm
40 60 30
50 60 30
60 100 40
75 100 60
100 150 60 14mm
125 200 100 22mm
Insulation tape
max.
°C
60 Vinyl adhesive tape
60
75
80 Self-fusing butyl rubber
tape
80
90 Polyester adhesive tape
90 Polyester adhesive tape
180 Silicon glass adhesive
tape
Min. grounding
wire thickness
200V 400V
class class
1.6mm
1.6mm
1.6mm
1.6mm
1.6mm
1.6mm
2 2.0mm
2 2.0mm
8mm 2 5.5mm 2
8mm 2 5.5mm 2
8mm 2 5.5mm 2
8mm 2 8mm 2
2 8mm 2
2 8mm 2
Tolerable
max.
temp.
°C
60
80
120
120
180