Mitsubishi Electric MXZ-8C48NA Manuel D'installation page 14

Thickness of Wire for Main Power Supply and On/Off Capacities
Model
4C36/5C52/
Outdoor Unit
Indoor Unit
*1. Be sure to ground the unit correctly. If required, take measures against leakage.
Total operating current of the indoor unit
F0 = 15A or less *2
F0 = 20A or less *2
F0 = 30A or less *2
Apply to IEC61000-3-3 about max. permissive system impedance.
*1 The Ground-fault interrupter should support inverter circuit.
The Ground-fault interrupter should combine using of local switch or wiring breaker.
*2 Please take the larger of F1 or F2 as the value for F0.
F1 = Total operating maximum current of the indoor units × 1.2
F2 = {V1 × (Quantity of Type 1)/C} + {V1 × (Quantity of Type 2)/C} + · · · + {V1 × (Quantity of Type 8)/C}
Indoor unit
Type 1 PEAD-A·AA, MVZ-A·AA
Type 2
Type 3
Type 4
Type 5
Type 6
Type 7
Type 8 Branch box (PAC-MK·BC(B))
C : Multiple of tripping current at tripping time 0.01 s
Please pick up "C" from the tripping characteristic of the breaker.
F2 = 5.1 × 2/8 + 19.8 × 5/8
= 13.65
*3 Current sensitivity is calculated using the following formula.
G1 = V2 × Quantity of Type 1 + V2 × Quantity of Type 2 + · · · + V2 × Quantity of Type 8 + V3 (Wire length [kW])
G1 Current sensitivity
30 or less 30 mA 0.1 sec or less
100 or less 100 mA 0.1 sec or less
Wire thickness
2
1.5 mm
2
2.5 mm
2
4.0 mm
1. Use a separate power supply for the outdoor unit and indoor unit.
ple, use wiring such as YZW.
6. Install an earth longer than other cables.
Warning:
Please turn off the main power supply when servicing. And do not touch the B1, B2
operate in order to warm the electrical parts.
Caution:
After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the branch
Be sure to connect the outdoor-branch box/indoor-branch box connecting cables directly to the units (no intermediate connections).
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
14
Minimum Wire Thickness
(mm
Power Supply
Main Cable*2
13.3 [AWG6]
208/230 VAC, 60Hz
8.4 [AWG8]
208/230 VAC, 60Hz
Minimum wire thickness (mm
Main Cable Branch
2.1/14 2.1/14
3.3/12 3.3/12
5.5/10 5.5/10
V3
48
56
66
Breaker for Breaker for Current
2 [AWG])
Wiring*1
Ground
50 A 30 mA 0.1 sec.
13.3 [AWG6] 50 A
40 A 30 mA 0.1 sec.
8.4 [AWG8] 40 A
Refer to installation manual of indoor unit.
2 /AWG)
Ground-fault interruper *1
Ground
2.1/14 15 A current sensitivity *3
3.3/12 20 A current sensitivity *3
5.3/10 30 A current sensitivity *3
V1 V2
26.9
19.8
16.2
9.9 2.4
7.4
6.8
3.5
5.1 3.0
B1
Outdoor unit
B2
Maximum rating of
Minimum cir-
over current protec-
Leakage cuit ampacity
tor device
42 A
or less
37 A
or less
Local switch (A)
Breaker for wiring
Capacity Fuse
15 15
20 20
30 30
Sample chart
6000
600
60
10
1
0.1
0.01
1 2 3 4 6
Rated Tripping current (x)
2 poles isolator (Switch)
Branch box
L1
L2
GR
52 A
52 A
15
20
30
SAMPLE
8 10 20
C
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