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6. Electrical work
Total operating current of the indoor unit
Minimum wire thickness (mm²)
Ground-fault interrupter *1
Local switch (A)
Breaker for wiring
(NFB)
Main cable
Branch
Ground
Capacity
Fuse
F0 = 16 A or less *2
1.5
1.5
1.5
20 A current sensitivity *3
16
16
20
F0 = 25 A or less *2
2.5
2.5
2.5
30 A current sensitivity *3
25
25
30
F0 = 32 A or less *2
4.0
4.0
4.0
40 A current sensitivity *3
32
32
40
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 indoor unit 1)/C} + {V1 × (Quantity of indoor unit 2)/C} + {V1 × (Quantity of indoor unit 3)/C} +
···
6000
600
60
10
1
1
2
3 4
6 8
C
10
20
Sample chart
Tripping T
ime
[s]
Rated Tripping current (x)
0.1
0.01
6.3. Types of control cables
1. Wiring transmission cables
Types of transmission cable
Shielding wire CVVS or CPEVS
Cable diameter
More than 1.25 mm
2
Length
Less than 200 m
2. M-NET Remote control cables
Types of remote control cable
Shielding wire MVVS
Cable diameter
0.5 to 1.25 mm
2
Length
Add any portion in excess of 10 m to within the longest allowable
transmission cable length 200 m.
3. MA Remote control cables
Types of remote control cable
2-core cable (unshielded)
Cable diameter
0.3 to 1.25 mm
2
Length
Less than 200 m
SAMPLE
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
V3
1.5 mm
2
48
2.5 mm
2
56
4.0 mm
2
66
• V1 and V2
V1 and V2 are the breaker coefficient.
V1: Breaker coefficient of rated current
V2: Breaker coefficient of current sensitivity
The values of V1 and V2 differ from depending on the model. Therefore, please refer to IM of each model.
• C : Multiple of tripping current at tripping time 0.01 s
Please pick up “C” from the tripping characteristic of the breaker.
<Example of “F2” calculation>
*Condition : PKFY-VLM × 2 + PLFY-VEM × 2 + PEFY-VMA × 1
V1 of PKFY-VLM = 19.8, V1 of PLFY-VEM = 19.8, V1 of PEFY-VMA = 38, C = 8 (refer to right sample chart)
F2 = 19.8 × 2/8 + 19.8 × 2/8 + 38 × 1/8
= 14.65
→ 16 A breaker (Tripping current = 8 × 16 A at 0.01 s)
*3 Current sensitivity is calculated using the following formula.
G1 = V2 × (Quantity of indoor unit 1) + V2 × (Quantity of indoor unit 2) + V2 × (Quantity of indoor unit 3)
+ ··· + V3 × (Wire length [km])
<Example of “G1” calculation>
*Condition : PKFY-VLM × 2 + PLFY-VEM × 2 + PEFY-VMA × 1
V2 of PKFY-VLM = 2.4, V2 of PLFY-VEM = 2.4, V2 of PEFY-VMA = 1.6, Wire thickness and length: 1.5 mm
2
0.2 km
G1 = 2.4 × 2 + 2.4 × 2 + 1.6 × 1 + 48 × 0.2
= 20.8
As a result , current sensitivity is 30 mA 0.1 sec or less.
V1
V2
PKFY-VLM
19.8
2.4
~ 220 - 240 V
Indoor
unit 1
Indoor
unit 1
Indoor
unit 2
Indoor
unit 3
Indoor
unit 3
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