Mitsubishi Electric PAC-MK50BC Installation Manual page 11

8. Electrical work
A
220/230/240 V
Fig. 8-10
Total operating current of the indoor unit
F0 = 15A or less *
F0 = 0A or less *
F0 = 30A or less *
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.
* Please take the larger of F1 or F as the value for F0.
F1 = Total operating maximum current of the indoor units × 1.
F = (V1/C)
Connect to Branch box (PAC-MK•BC)
Indoor unit
Type 1 SEZ-KD•VA, PCA-RP•KAQ, PLA-ZRP•BA(.UK)
Type  PEAD-RP•JAQ(L).UK
Type 3 MLZ-KA•VA, SLZ-KA•VAQ(L)3
Type 4 MSZ-FH•VE, MSZ-SF•VE, MSZ-EF•VE, MSZ-SF•VA
Type 5 MFZ-KJ•VE
Type 6 Branch box (PAC-MK•BC)
C : Multiple of tripping current at tripping time 0.01s
Please pick up "C" from the tripping characteristic of the breaker.
*Condition Branch Box ×  + SEZ-KD•VA × 5, C=8 (refer to right sample chart)
F = 5.1 × /8 + 19.8 × 5/8
= 14.9
→ 16A breaker (Tripping current = 8 × 16A at 0.01s)
*3 Current sensitivity is calculated using the following formula.
G1 = V + V3 × (Wire length[km])
G1 Current sensitivity
30 or less 30 mA 0.1sec or less
100 or less 100 mA 0.1sec or less
Wire thickness (mm /AWG)

.1/14
3.3/1
5.3/10
Warning:
In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power
line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power
is energized. If isolator should be used between outdoor unit and branch box/indoor unit and branch box, please use 3-pole type.
Power supply from Outdoor unit
L
Power supply
N
Supply power separately to branch box and outdoor unit
L
Power supply
N
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 box(es) or indoor units.
B D
L N M1 M2 S
C
TB2B TB5
Minimum wire thickness (mm²/AWG)
Main cable Branch
.1/14 .1/14
3.3/1 3.3/1
5.3/10 5.3/10
Connect to Connection kit (PAC-LV11M)
V1 Indoor unit
V
19.8 MSY-EF•VE, MSY-GE•VA, MSY-GH, MSZ-GE•VA,
Type 1
MSZ-SF•VA, MSZ-SF•VE,MSZ-EF•VE, MSZ-FH•VE
6.9
Type  MFZ-KJ•VE
9.9
.4
Type 3 Connection kit (PAC-LV11M)
6.8
7.4
5.1
3.0
V3
48 Indoor unit
56 Branch Box
66
L L
Isolator (Switch)
Outdoor unit
N N
L
L
Isolator (Switch)
Branch box
N
N
Power supply wiring (Supply power separately to branch box
and outdoor unit)
• Install an earth line longer than other cables.
• Power supply cords of appliance shall not be lighter than design 45IEC57 or
7IEC57, 45 IEC 53 or 7 IEC 53.
• A switch with at least 3 mm, 1/8 inch contact separation in each pole shall be
provided by the air conditioner installation.
[Fig. 8-10]
Ground-fault interrupter
A
Local switch/Wiring breaker
B
Branch Box
C
Pull box
D
Ground Capacity Fuse
15
.1/14
3.3/1 0
5.3/10 30
V1
6.8
7.4
3.5
V
.4
3.0
2 pole isolator
(Switch)
L
B1
Branch box
B2
N
3 pole isolator
(Switch)
S1
S1
S2 "A-control
S2
Indoorunit"
S3
S3
Breaker for wiring
Ground-fault interrupter *1
(NFB)
15 15 15A current sensitivity *3
0A current sensitivity *3
0 0
30 30 30A current sensitivity *3
Indoor unit
V
PMFY-VBM, PLFY-VBM, PEFY-VMS1, PCFY-VKM
Type 1
PKFY-VHM, PKFY-VKM, PFFY-VLRMM, PFFY-VKM
.4
Type  PLFY-VCM
Type 4 PKFY-VBM
Type 5 PEFY-VMA
PLFY-VLMD, PEFY-VMH,PEFY-VMR, PDFY-VM
Type 6
PFFY-VLEM, PFFY-VLRM
Sample chart
6000
600
60
10
1
0.1
0.01
1 2
Rated Tripping current (x)
3 pole isolator
(Switch)
S1
S1
S2
"A-control
S2
Indoor unit"
S3
S3
V1
V
19.8
.4
9.9
3.5
38.0 1.6
0 0
SAMPLE
3 4 6 8 10 20
C
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