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Specification of electronic wire
Power supply
MCCB
Max : 242V
X A
Min : 198V
Decide the capacity of ELCB(or MCCB+ELB) by below formula.
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.
n
Coef×35.6×L
∑ (
k=1
coef: 1.55
Lk: Distance among each indoor unit[m(ft)], Ak: Power cable specification[mm
ik: Running current of each unit[A]
Example of Installation
- Total power cable length L = 328ft(100m) , Running current of each units 1[A]
- Total 10 indoor units were installed
ELCB
Or MCCB+
ELB
0ft(0m)
Apply following equation.
n
Coef×35.6×L
∑ (
k=1
Calculation
Installing with 1 sort wire.
0.0039inch
-2.2[V]
220[V]
Installing with 2 different sort wire.
0.0062inch
220[V]
ELB or ELCB
Power cable
X A, 30mA
0.1 sec
×i
k
k
) <
1000×A
k
10[A]
9[A]
Indoor unit1
32.8ft(10m)
×i
10% of input
k
k
) <
voltage[V]
1000×A
k
2
(2.5mm
2
)
0.0039inch
2
(2.5mm
-2.0[V]
-(2.2+2.0+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-11.2[V]
2
(4.0mm
2
)
0.0062inch
2
(4.0mm
-1.4[V]
-1.2[V]
-(1.4+1.2+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-10.5[V]
Earth cable
2
0.0039inch
0.0039inch
2
2
(2.5mm
)
(2.5mm
)
10% of input voltage[V]
Indoor unit2
65.6ft(20m)
2
)
············ 0.0039inch
2
(2.5mm
2
)
············ 0.0039inch
2
(2.5mm
Communication cable
2
0.0012~0.0023inch
2
(0.75~1.5mm
)
2
(inch
2
)]
1[A]
Indoor unit10
328ft(100m)
2
) ············
208.8[V](Within 198V~242V)
it's okay
2
) ············
209.5[V](Within 198V~242V)
it's okay
2
31
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