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ELECTRICAL PRACTICES (CONT'D)
EXAMPLE
Application: Max Amps = 11A, Length = 40ft, Voltage = 120V 1ph
Solution: 40ft is between the 25ft and 50ft columns, so the larger of the two col-
umns is chosen. Likewise, 11A is between the 10A and 12A rows, so the larger
of the two rows is chosen. 14 AWG (2.5mm
example.
EXTENSION CORD SIZES
120V Supply
Max
Length
230V Supply
Max Amps
8
10
12
14
16
18
20
25
30
230V Supply
Max
400V Supply
Length
480V Supply
Max Amps
20
30
40
50
60
70*
80*
90*
100*
* 75°C TYPE W CORD OR EQUIVALENT
Note: The table is based on a <10% voltage loss, data from the U.S. National Electrical Code Tables 400.5(A) & 400.5(B) and typical resis-
tances for copper wire.
2
) is the minimum wire size for this
Single Phase Equipment
25ft (7.5m)
50ft (15m)
50ft (15m)
100ft (30m)
2
16 AWG (1.5mm
)
16 AWG (1.5mm
16 AWG (1.5mm
2
)
16 AWG (1.5mm
14 AWG (2.5mm
2
)
14 AWG (2.5mm
2
14 AWG (2.5mm
)
14 AWG (2.5mm
14 AWG (2.5mm
2
)
14 AWG (2.5mm
2
14 AWG (2.5mm
)
14 AWG (2.5mm
12 AWG (4mm
2
)
12 AWG (4mm
2
12 AWG (4mm
)
12 AWG (4mm
10 AWG (6mm
2
)
10 AWG (6mm
25ft (7.5m)
50ft (15m)
40ft (12m)
80ft (25m)
50ft (15m)
100ft (30m)
10 AWG (6mm
2
)
10 AWG (6mm
2
8 AWG (10mm
)
8 AWG (10mm
6 AWG (16mm
2
)
6 AWG (16mm
2
4 AWG (25mm
)
4 AWG (25mm
4 AWG (25mm
2
)
4 AWG (25mm
6 AWG (16mm
2
)*
6 AWG (16mm
2
4 AWG (25mm
)*
4 AWG (25mm
4 AWG (25mm
2
)*
4 AWG (25mm
2
4 AWG (25mm
)*
4 AWG (25mm
75ft (25m)
100ft (30m)
150ft (45m)
200ft (60m)
Minimum Wire Size
2
2
)
16 AWG (1.5mm
)
16 AWG (1.5mm
2
)
16 AWG (1.5mm
2
)
16 AWG (1.5mm
2
)
14 AWG (2.5mm
2
)
14 AWG (2.5mm
2
2
)
14 AWG (2.5mm
)
14 AWG (2.5mm
2
)
14 AWG (2.5mm
2
)
14 AWG (2.5mm
2
2
)
14 AWG (2.5mm
)
12 AWG (4mm
2
)
12 AWG (4mm
2
)
12 AWG (4mm
2
2
)
12 AWG (4mm
)
12 AWG (4mm
2
)
10 AWG (6mm
2
)
10 AWG (6mm
3 Phase Equipment
75ft (25m)
100ft (30m)
120ft (35m)
160ft (50m)
150ft (45m)
200ft (60m)
Minimum Wire Size
2
)
10 AWG (6mm
2
)
10 AWG (6mm
2
2
)
8 AWG (10mm
)
8 AWG (10mm
2
)
6 AWG (16mm
2
)
6 AWG (16mm
2
2
)
4 AWG (25mm
)
4 AWG (25mm
2
)
4 AWG (25mm
2
)
4 AWG (25mm
2
)*
6 AWG (16mm
2
)*
6 AWG (16mm
2
2
)*
4 AWG (25mm
)*
4 AWG (25mm
2
)*
4 AWG (25mm
2
)*
4 AWG (25mm
2
2
)*
4 AWG (25mm
)*
4 AWG (25mm
13
Safety
150ft (45m)
200ft (60m)
300ft (90m)
400ft (120m)
2
2
)
14 AWG (2.5mm
)
14 AWG (2.5mm
2
)
14 AWG (2.5mm
2
)
12 AWG (4mm
2
)
12 AWG (4mm
2
)
12 AWG (4mm
2
2
)
12 AWG (4mm
)
10 AWG (6mm
2
)
12 AWG (4mm
2
)
10 AWG (6mm
2
2
)
12 AWG (4mm
)
10 AWG (6mm
2
)
10 AWG (6mm
2
)
10 AWG (6mm
2
2
)
10 AWG (6mm
)
8 AWG (10mm
2
)
8 AWG (10mm
2
)
8 AWG (10mm
150ft (45m)
200ft (60m)
250ft (75m)
325ft (100m)
300ft (90m)
400ft (120m)
2
)
10 AWG (6mm
2
)
10 AWG (6mm
2
2
)
8 AWG (10mm
)
8 AWG (10mm
2
)
6 AWG (16mm
2
)
6 AWG (16mm
2
2
)
4 AWG (25mm
)
4 AWG (25mm
2
)
4 AWG (25mm
2
)
4 AWG (25mm
2
)*
6 AWG (16mm
2
)*
6 AWG (16mm
2
2
)*
4 AWG (25mm
)*
4 AWG (25mm
2
)*
4 AWG (25mm
2
)*
4 AWG (25mm
2
2
)*
4 AWG (25mm
)*
4 AWG (25mm
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)*
2
)*
2
)*
2
)*
406124_RevC
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