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Recommended AC power line sizes
Recommended AC power line sizes
About AC power
feeds
Longer AC power feeds need to be properly designed to preserve voltage levels
to the equipment. The wiring from the breaker panel to the power strip, which
supplies power to the storage appliance and disk shelves, can often exceed 50
feet.
Note
Total AC wire length = breaker to wall or ceiling extension cable or
ceiling drop.
The following table lists the recommended conductor size for 2% voltage drop
for a particular distance in feet (taken from the Radio Engineer’s Handbook).
The following table list the approximate equivalent wire gauge (American Wire
Gauge (AWG) to Harmonized Cordage).
110V, single-phase
20A
circuit
30A
circuit
40A
circuit
50A
circuit
25 feet
12 AWG
10 AWG
8 AWG
8 AWG
50 feet
8 AWG
6 AWG
6 AWG
4 AWG
75 feet
6 AWG
4 AWG
4 AWG
2 AWG
220V, single-phase
20A
circuit
30A
circuit
40A
circuit
50A
circuit
25 feet
14 AWG
12 AWG
12 AWG
10 AWG
50 feet
12 AWG
10 AWG
8 AWG
8 AWG
75 feet
10 AWG
8 AWG
6 AWG
6 AWG
AWG
8
10
12
Harmonized, mm-mm
mm-mm = millimeter
squared
4.0
2.5
1.5