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User’s manual of recovery vent
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lators HRU-M
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n
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stA
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r-W-450
Selection of electrical cable cross-section
U
n�t M
o
d
e
l
Un�t Power Input
(kW)
HRU-M
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n
�
stA
�
r-W-450
230
0.166
0.5
0.5
1.5
Un�t Voltage
(V)
Current
(A)
Fuse
(A)
Cable Cross-Sect�on(mm²)
for 50M and PF=0.8
I
current
I
cable
> I
fuse
> I
current
I
cable
> I
fuse
> I
current
I
cable
= 12A
S3 = 0.5 mm²
Cable cross-section S = Max (S1, S2,
S
3, 1.5 mm²)
S =
Max (0.5, 0.5, 0.5, 1.5)
S =
1.5 mm²
I
cable
> 0.5A > 0.09A
“I
fuse
”which will be higher than “I
current
”, is selected.
S2 >
0.09 mm² > 0.5 mm²
S2 =
0.5 mm²
Cable Cross-Section S=Max (S1, S2, S3, 1.5mm²)
%e
S
0.09 mm²
S
,
I
current
I
cable
%e=%3
%
e =
%3
S1 =
0.5 mm²
1
1
P
I
U
S
k
L
%e
:
:
:
:
:
:
:
Power
Current
Voltage
Conductor cross section
Conductor coefficient
Conductor length
The voltage drop
2
2
3
3
>
P
166 W
100.P.L
100.166.50
100.P.L
U.CosQ
230.0,8
k.S.U²
56.3.230²
k.%e.U²
=
=
=
=
=
=
=
P
U
PF
L
%e
k
:
:
:
:
:
:
0,169 kW
230V
CosQ
: 0,8
50m
%3
56m /
Cable Cross-Sect�on Formulas
Example of Cable Cross-Sect�on Calculat�on
The cable will be used, is selected from the cable cross-section table so
that the equivalent ampere value in the table should be high
er than
calculated “I
current
” value.
The cable will be used, is selected from the cable cross-section table so
that the equivalent ampere value in the table should be higher than
selected “I
fuse
” value.
I
current
0.9 A