Mitsubishi Electric HR Series, Instruction Manual

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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
Output
(kW)
Min. wire
thickness*1
Max. line
length*2
Overcurrent breaker (A)*3 Rated current of
excess scale
ammeter for
motor (A)
Min. grounding
wire thickness
Direct-ON start
Using starter
(Star-Delta start)
200V
class
400V
class
200V
class
400V
class
200V
class
400V
class
200V
class
400V
class
200V
class
400V
class
200V
class
400V
class
0.2 1.6mm 1.6mm 144m 580m 15 15 - - 5 5 1.6mm 1.6mm
0.4 1.6mm 1.6mm 81m 326m 15 15 - - 5 5 1.6mm 1.6mm
0.75 1.6mm 1.6mm 54m 217m 15 15 - - 5 5 1.6mm 1.6mm
1.5 1.6mm 1.6mm 32m 130m 30 15 - - 10 5 1.6mm 1.6mm
2.2 1.6mm 1.6mm 23m 94m 30 15 - - 10 5 1.6mm 1.6mm
3.7 2.0mm 1.6mm 23m 60m 50 30 - - 15 10 2.0mm 1.6mm
5.5 5.5mm 2 1.6mm 27m 40m 75 40 40 20 30 15 5.5mm 2 2.0mm
7.5 8mm 2 2.0mm 31m 48m 100 50 50 30 30 15 5.5mm 2 2.0mm
11 14mm 2 5.5mm 2 37m 57m 125 75 75 40 60 30 8mm 2 5.5mm 2
15 22mm 2 8mm 2 43m 65m 125 100 100 50 60 30 8mm 2 5.5mm 2
18.5 38mm 2 14mm 2 61m 93m 125 100 125 60 100 40 8mm 2 5.5mm 2
22 38mm 2 22mm 2 51m 124m 150 125 125 75 100 60 8mm 2 8mm 2
30 60mm 2 22mm 2 62m 92m 200 125 175 100 150 60 14mm 2 8mm 2
37 100mm 2 38mm 2 86m 126m 250 125 225 125 200 100 22mm 2 8mm 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.)
Table 6 Examples of motor wiring materials
Thermal
class of
motor
Wiring material (Example)
Insulation wiring Cable Insulation tape
Tolerable
max.
temp.
°C
Tolerable
max.
temp.
°C
Tolerable
max.
temp.
°C
120 (E)
Vinyl insulated wire 60 Vinyl cable 60 Vinyl adhesive tape 60
Rubber insulated wire 60 Natural rubber cable 60
Class 2 vinyl insulated
wire
75 Polyethylene cable 75
130 (B)
Polyethylene insulated
wire
75 Butyl rubber cable 80 Self-fusing butyl rubber
tape
80
Ethylene propylene
rubber insulated wire
80 EP rubber cable 80
Bridged polyethylene
insulated wire
90 Bridged polyethylene
cable
90 Polyester adhesive tape 120
155 (F)
Bridged polyethylene
insulated wire
90 Bridged polyethylene
cable
90 Polyester adhesive tape 120
Silicon rubber insulated
glass mesh wire
180 Silicon rubber cable 180 Silicon glass adhesive
tape
180
Remarks : The tolerable max. temperature indicates the main examples for each material. Some products
may tolerate a higher temperature. Consult the maker for details.