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4.4 Selecting and Preparing the
Electrical Wiring
4.4.1 Electrical compliance
This equipment conforms to:
EN/IEC 61000-3-12 specifications which states that the
short circuit capacity (of the power supply), Ssc, is
greater than or equal to the minimum Ssc value of the
interface point between the user's power supply and the
public system.
The
installation
personnel
responsibility
to
consult
the
operators when necessary to ensure that the equipment
only connects to a power supply with short circuit
capacity, Ssc, greater than or equal to the minimum Ssc
value.
Capacity
Minimum Ssc value(kW)
8HP
10HP
12HP
14HP
16HP
18HP
20HP
22HP
Note:
The European / international technical standards
specified a harmonic current limit for devices connected
to a public low-voltage system where the input current
of each phase > 16 A and ≤ 75 A.
Table 4.14
Outdoor Unit
System
Voltage
Frequency
(V)
(Hz)
8HP
380-415
50
10HP
380-415
50
50
12HP
380-415
14HP
380-415
50
16HP
380-415
50
50
18HP
380-415
20HP
380-415
50
22HP
380-415
50
Phase and frequency of power supply system: 3N~ 50/Hz, 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 on electrical systems where voltage supplied to unit terminals is not below or above listed range
limits. 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.
or
users
have
the
distribution
network
Table 4-12
4122
5092
5577
6789
7274
8001
9699
10911
Power Current
Min.
Max.
MCA
(V)
(V)
(A)
342
456
17.0
342
456
21.0
342
456
23.0
342
456
28.0
342
456
30.0
342
456
33.0
342
456
40.0
342
456
45.0
INFORMATION
i
22
4.4.2 Safety device requirements
1. Select
the
wire
diameters(
individually for each unit based on the table 4.13 and
table 4.14， where the rated current in table 4.13
means MCA in table 4.14. In case the MCA exceeds
63A, the wire diameters should be selected according
to the national wiring regulation.
2. Maximum allowable voltage range variation between
phases is 2%.
3. Select circuit breaker that having 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:
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
TOCA
MFA
MSC
RLA
(A)
(A)
(A)
(A)
-
23.5
17.0
20
-
21.0
25
23.5
-
25.2
23.0
32
-
27.2
28.0
32
-
30.0
40
30.5
-
30.5
33.0
40
37.5
40.0
50
-
45.0
50
-
38.5
minimum
value)
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
Fan Motor
Power
FLA
(kW)
(A)
0.2+0.2
0.65+0.65
0.2+0.2
0.65+0.65
0.2+0.2
0.65+0.65
0.2+0.2
0.65+0.65
0.56+0.56
2.0+2.0
0.56+0.56
2.0+2.0
0.56+0.56
2.0+2.0
0.56+0.56
2.0+2.0
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