Wiring Of Main Power Supply And Equipment Capacity; Important - Mitsubishi Electric MXZ-8C48NA2 Manuel D'installation

6. Electrical work
6.5. Wiring of main power supply and equipment capacity
Schematic Drawing of Wiring (Example) (Fig. 6-3)
<When Power Is Supplied from the Outdoor Unit>
A
208/230 V AC, 60 Hz
<When Power Is Supplied Separately>
A
208/230 V AC, 60 Hz
Thickness of Wire for Main Power Supply and On/Off Capacities
<When power is supplied separately>
Model
8C48NA
*C**NAHZ
Outdoor Unit
8C60NA
Branch Box
<When power is supplied from the outdoor unit>
Model
8C48NA
*C**NAHZ
Outdoor Unit
8C60NA
Branch Box
*1. Please follow applicable federal, state, or local codes to prevent potential leakage/electric shock. Or install a ground fault interrupt for the prevention of leakage and
electric shock.

IMPORTANT

If a current leakage breaker is used, it should be compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker
can cause the incorrect operation of inverter.
*2. Use copper supply wires. Use the electric wires over the rating voltage 300 V.
Total operating current of the indoor unit
en
F0 = 15 A or less *2
F0 = 20 A or less *2
F0 = 30 A 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 Type1)/C} + {V1 × (Quantity of Type2)/C} + {V1 × (Quantity of Type3)/C} + ... + {V1 × (Quantity of Type7)/C}
15
B
L1/L2 B1/B2
L1/L2
GR
L1/L2
B
208/230 V AC, 60 Hz
L1/L2
GR
Minimum Wire Thickness
Power Supply (mm 2 [AWG])
Main Cable*2 Ground
5.3 [AWG10] 5.3 [AWG10]
8.4 [AWG8] 8.4 [AWG8]
208/230 V AC,
60 Hz
8.4 [AWG8] 8.4 [AWG8]
Minimum Wire Thickness
(mm 2 [AWG])
Power Supply
Main Cable*2 Ground
8.4 [AWG8] 8.4 [AWG8]
208/230 V AC, 13.3 [AWG6] 13.3 [AWG6]
60 Hz
13.3 [AWG6] 13.3 [AWG6]
Minimum wire thickness (mm
Main Cable Branch
2.1/14 2.1/14
3.3/12 3.3/12
5.3/10 5.3/10
C
S1/S2/S3
D
S1/S2/S3
D
S1/S2/S3
D
C
A Switch (Breakers for Wiring and Current Leakage (if you use))
S1/S2/S3
D
B Outdoor Unit
S1/S2/S3
D C Branch Box
D A-Control indoor unit (M, P, S, series indoor unit)
S1/S2/S3
E Pull Box
E
A
C
S1/S2/S3
L1/L2
S1/S2/S3
S1/S2/S3
Fig. 6-3
Breaker for Breaker for Current Leakage
Wiring*1 (if you use)
30 A 30 A 30 mA 0.1 sec. or less
40 A 40 A 30 mA 0.1 sec. or less
40 A 40 A 30 mA 0.1 sec. or less
Refer to installation manual of Branch Box.
Breaker for Breaker for Current Leakage
Wiring*1 (if you use)
40 A 40 A 30 mA 0.1 sec. or less
45 A 45 A 30 mA 0.1 sec. or less
50 A 50 A 30 mA 0.1 sec. or less
Refer to installation manual of Branch Box.
2 /AWG)
Ground-fault interruper *1
(if you use)
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
C
S1/S2/S3
D D
L1/L2
S1/S2/S3
D
D
S1/S2/S3
D
Minimum circuit
Maximum rating of over
ampacity
current protector device
29 A 44 A
36 A
44 A
36 A 45 A
Minimum circuit
Maximum rating of over
ampacity
current protector device
35 A
50 A
42 A 50 A
46 A
55 A
Local switch (A) Breaker for wiring
(NFB)
Capacity Fuse
15 15 15
20 20 20
30 30 30