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Recommended AC power line sizes

When installing your storage system, you must determine the AC power line lengths running from the storage system to the power source.

By properly designing longer AC power feeds, you can preserve voltage levels to the equipment. The longer power feeds—the wiring from the breaker panel to the power strip, which supplies power to the storage system and disk shelves—can often exceed 50 feet.
Note
Total AC wire length = breaker to wall or ceiling outlet + extension cable or ceiling drop.
The following tables list the recommended conductor size for 2 percent voltage drop for a particular distance measured in feet (taken from the Radio Engineer's Handbook). The circuits in the following tables are described in American Wire Gauge (AWG) measurements:
110V, single-phase20A circuit30A circuit40A circuit50A circuit
25 feet12 AWG10 AWG8 AWG8 AWG
50 feet8 AWG6 AWG6 AWG4 AWG
75 feet6 AWG4 AWG4 AWG2 AWG
220V, single-phase20A circuit30A circuit40A circuit50A circuit
25 feet14 AWG12 AWG12 AWG10 AWG
50 feet12 AWG10 AWG8 AWG8 AWG
75 feet10 AWG8 AWG6 AWG6 AWG

The following table lists the approximate equivalent wire gauge (AWG to Harmonized Cordage).

AWG81012
Harmonized, mm-mm

mm-mm = millimeter squared

4.02.51.5