Airtecnic ENERGY BOX AC, Operation Manual

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w w w . a i r t e c h n i c . g r
Energy Box AC-Α, AC
14
w w w . a i r t e c h n i c . g r

ATHENS
+30 211 70 55 500 /
THES/NIKI
+30 2311 82 40 00
CABLE CROSS-SECTION FORMULAS
1
I current ꞊
P
√ 3.U.CosQ
I cable > I current
2
%e ꞊
100.P.L
k.S.U²
, S ꞊
100.P.L
k.%e.U²
%e ꞊ %3
3
I cable > I fuse ≥ I current
Cable Cross-Section
S = Max (S1, S2, S3, 1,5 mm²)
* It is suitable for units with 230V supply voltage.
P:
Power
I: Current
U: Voltage
S: Conductor cross section
k:
Conductor coefficient
L: Conductor length
%e: The voltage drop
P: 4,9 kW
L: 50 m
U: 400 V
%e: %3
PF: CosQ : 0,8
k: 56 m/Ω
EXAMPLE OF CABLE CROSS-
SECTION CALCULATION
1
I current ꞊
4900 W
√ 3.400.0,8
꞊ 6,68 A
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 calculated “I current” value.
S1 = 0,5 mm²
2
%e ꞊ %3
S ꞊
100.4900.50
56.3.400²
S2 ≥ 0,91 mm²
S2 = 1 mm²
3
I cable > I fuse ≥ I current
I cable > 10 A ≥ 8,85 A
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 cable =15 A
S3 = 0,75 mm²
Cable cross-section
S=Max (S1, S2, S3, 1,5 mm²)
S=Max (0,5, 1, 0,75, 1,5)
S=1,5 mm²
* It must be considered the above information for compressor calculation in ENERGY-BOX AC-Α/ENERGY-BOX
AC 3.000 and 4.000 unit models.