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3-6 Receiving & Installation MN2403
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.
Table 3-2 Voltage Drop in Electrical Extension Cords
Nominal
cross
section
A.W.G.
Gauge
No.
Allowable
current
No.of strands
/ strands dia.
Resistance
Current Amp.
No./mmmm
2
No. A 1A 3A 5A 8A 10A 12A 15A
0.75 18 7 30/0.18 2.477 2.5V 8V 12.5V
Voltage drop
1.27 16 12 50/0.16 1.486 1.5V 5V 7.5V 12V 15V 18V
2.0 14 17 37/0.26 0.952 1V 3V 5V 8V 10V 12V 15V
3.5 12 to 10 23 45/0.32 0.517 1.5V 2.5V 4V 5V 6.5V 7.5V
5.5 10 to 8 35 70/0.32 0.332 1V 2V 2.5V 3.5V 4V 5V
Ω/100m