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Voltage Drop in Extension Cords
When a long electric extension cord is used to connect an appliance or tool to the generator, a
certain amount of voltage drop or loss occurs in the extension cord which reduces the effective
voltage available for the appliance or tool. Table 3-2 illustrates the approximate voltage loss
when an extension cord of 300 feet (approx. 100 meters) is used to connect an appliance or tool
to the generator.
Nominal
A.W.G.
cross
Gauge
section
No.
mm
No.
2
0.75
18
1.27
16
2.0
14
3.5
12 to 10
5.5
10 to 8
3-6 Receiving & Installation
Table 3-2 Voltage Drop in Electrical Extension Cords
Allowable
No.of strands
Resistance
current
/ strands dia.
A
No./mm
Ω/100m
7
30/0.18
2.477
12
50/0.16
1.486
17
37/0.26
0.952
23
45/0.32
0.517
35
70/0.32
0.332
Current Amp.
1A
3A
5A
8A
10A
2.5V
8V
12.5V
1.5V
5V
7.5V
12V
15V
1V
3V
5V
8V
10V
1.5V
2.5V
4V
1V
2V
2.5V
3.5V
12A
15A
18V
12V
15V
5V
6.5V
7.5V
4V
5V
MN2403
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