3. Installation
3.4 Selecting cable
• Select a cable with sufficient diameter by considering the permissible current on the cable and the
distance from the generator to the load.
• If the current flowing to the load exceeds the permissible current of the cable, resultant
overheating may burn the cable. Similarly, if the cable is too small in thickness to the length, the
input voltage to the load will fall to cause the load input power to drop, as a result, the performance
of the machine cannot be displayed.
Cable Thickness A (mm
2
)
Working
Current I (A)
A130863
• Simplified three-phase three-wire formula to seek voltage drop or cross-sectional area of the cable
from cable length and working current. Select such a cable length and thickness so that the
voltage drop will remain less than 5%.
Output system
Voltage drop
Cross-sectional
area of the cable
e : Voltage drop(V)
Three-phase
3-wire Type
Three-phase
4-wire Type
e =
30.8XLXI
A
= 30.8XLXI
1,000XA
1,000Xe
17.8XLXI
1,000XA
A=
30.8XLXI
l,000Xe'
e' :Voltage drop between an outside
line or one line of each phase,
and a neutral line (V)
A : Cable thickness (mm
2
)
L : Cable length (m)
I : Working current (A)
• The following tables show the relations between the cabtyre cable length and the cable thickness
(nominal cross-sectional area) suited to the working current.
(Based on the condition that working voltage is 200 V, with voltage drop of lOV.)
Single-Conductor Cabtyre Cable
Unit:mm
2
�gth
Curre
50m
75m
100m
125m
150m
200m
50A
8
14
22
22
30
38
lOOA
22
30
38
50
50
60
150A
38
38
50
60
80
100
Three-Conductor Cabtyre Cable
Unit:mm
2
�gth
50m
75m
100m
125m
150m
200m
50A
14
14
22
22
30
38
100A
38
38
38
50
50
60
150A
22X2
22X2
38X2
38X2
38X2
50X2
3-8
BTW Equipment Supply LLC dba Airman Arizona • www.btwequipmentsupply.com www.airmanarizona.com
SDG45S-8E1
Instruction Manual
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