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4.4 Selecting and Preparing
the Electrical Wiring
4.4.1 Safety device requirements
1. Select
the
wire
diameters
individually for each unit based on Table 4.13 and
Table 4.14, where the rated current in Table 4.13
refers to MCA in Table 4.14. If the MCA exceeds 63A,
the wire diameters should be selected according to
the national wiring regulation.
2. The maximum allowable voltage range variation
between phases is 2%.
3. Select circuit breakers that have a contact separation
in all poles not less than 3 mm providing full
disconnection, where MFA is used to select the
current circuit breakers and residual current operation
breakers:
Outdoor Unit
System
Voltage
Frequency
(V)
(Hz)
8HP
380-415
50
10HP
380-415
50
12HP
380-415
50
14HP
380-415
50
16HP
380-415
50
18HP
380-415
50
20HP
380-415
50
22HP
380-415
50
24HP
380-415
50
26HP
380-415
50
28HP
380-415
50
30HP
380-415
50
32HP
380-415
50
Phase and frequency of power supply system: 3N-50Hz, Voltage: 380-415V
Abbreviations:
MCA: Minimum Circuit Amps; TOCA: Total Over-current Amps; MFA: Maximum Fuse Amps; MSC: Maximum Starting
Current (A); RLA: Rated Load Amps; FLA: Fan Load Amps.
Units are suitable for use in electrical systems where voltage supplied to unit terminals is not below or above listed range
limits. The maximum allowable voltage variation between phases is 2%.
Select wire size based on the value of MCA.
TOCA indicates the total overcurrent amps value of each OC set.
MFA is used to select overcurrent circuit breakers and residual-current circuit breakers.
MSC indicates the maximum current on compressor start-up in amps.
RLA is based on the following conditions: indoor temperature 27°C DB, 19°C WB; outdoor temperature 35°C DB.
(minimum
value)
Power Current
Min.
Max.
MCA
TOCA
(V)
(V)
(A)
342
440
20.7
17.0
342
440
22.5
18.8
342
440
26.8
23.0
342
440
31.0
26.2
342
440
36.2
31.4
342
440
38.0
33.0
342
440
39.5
40.5
342
440
41.5
47.1
342
440
52.0
46.0
342
440
54.0
51.0
342
440
57.4
51.0
342
440
63.2
56.8
342
440
57.0
63.4
INFORMATION
i
27
Nominal cross-sectional area (mm
Rated current
of appliance
Flexible cords
(A)
≤ 3
0.5 and 0.75
> 3 and ≤ 6
0.75 and 1
> 6 and ≤ 10
1 and 1.5
> 10 and ≤ 16
1.5 and 2.5
> 16 and ≤ 25
2.5 and 4
> 25 and ≤ 32
4 and 6
> 32 and ≤ 50
6 and 10
> 50 and ≤ 63
10 and 16
Compressor
MFA
MSC
RLA
(A)
(A)
(A)
(A)
-
12.7
20
-
13.0
25
-
17.0
32
-
26.8
32
-
31.2
40
-
17.9+17.0
40
-
18.5+17.7
50
-
20.0+19.2
50
-
63
22.7+22.2
-
63
20.3+20.2
-
63
21.7+22.0
-
80
24.5+24.8
-
80
25.5+25.8
Table 4.13
2
)
Cable for fixed
wiring
1 to 2.5
1 to 2.5
1 to 2.5
1.5 to 4
2.5 to 6
4 to 10
6 to 16
10 to 25
Table 4.14
Fan Motor
Power
FLA
(kW)
(A)
0.56
1.7
0.56
1.7
0.56
1.8
0.92
2.8
0.92
3.0
0.56+0.56
1.8+1.8
0.56+0.56
1.8+1.8
0.56+0.56
2.0+2.0
0.56+0.56
2.0+2.0
0.92+0.92
2.2+2.2
0.92+0.92
2.2+2.2
0.92+0.92
2.2+2.2
0.92+0.92
2.2+2.2
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