15
Rating current
Specification of electronic wire
Power supply
MCCB
ELB or ELCB Power cable Earth cable
Communication cable
Max : 242V
Min : 198V
X
A
X
A, 30mmA
0.1 s
2.5mm
2
2.5mm
2
0.75~1.5mm
2
Decide the capacity of ELCB(or MCCB+ELB) by below formula.
Power supply cords of parts of appliances for outdoor use shall not be
lighter than polychloroprene sheathed flexible cord. (Code designation
IEC:60245 IEC 57 / CENELEC: H05RN-F or IEC:60245 IEC 66 / CENELEC: H07RN-F)
The capacity of ELCB(or MCCB+ELB)
X
[A] = 1.25 X 1.1 X ∑Ai
X
: The capacity of ELCB(or MCCB+ELB).
∑Ai : Sum of Rating currents of each indoor unit.
Refer to each installation manual about the rating current of indoor unit.
Decide the power cable specification and maximum length within
10% power drop among indoor units.
coef: 1.55
Lk: Distance among each indoor unit[m], Ak: Power cable specification[mm
2
]
ik: Running current of each unit[A]
∑ (
Coef×35.6×L
k
×i
k
) <
10% of input voltage[V]
1000×A
k
n
k=1
Example of Installation
- Total power cable length L = 100(m), Running current of each units 1[A]
- Total 10 indoor units were installed
Apply following equation.
∑ (
Coef×35.6×L
k
×i
k
) <
10% of input
voltage[V]
1000×A
k
n
k=1
Calculation
Installing with 1 sort wire.
220[V]
-2.2[V]
-2.0[V]
············ 2.5[mm
2
] ············
208.8[V](Within 198V~242V)
-(2.2+2.0+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-11.2[V]
it's okay
2.5[mm
2
]
2.5[mm
2
]
Installing with 2 different sort wire.
220[V]
-1.4[V]
-1.2[V]
············ 2.5[mm
2
] ············
209.5[V](Within 198V~242V)
-(1.4+1.2+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-10.5[V]
it's okay
4.0[mm
2
]
4.0[mm
2
]
10[A]
Indoor unit10
20[m]
10[m]
0[m]
9[A]
1[A]
100[m]
Indoor unit2
Indoor unit1
ELCB
or MCCB+
ELB
Unit
Model
Rating
current
AM
NJD
022
028
036
045
056
0.13A
0.25A
0.29A
0.30A
0.49A
