Recommended Ac Power Line Sizes - Fujitsu ETERNUS AX Series Installation And Cabling Manual

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:
Table 7:
110V, single-phase 20A circuit
25 feet
50 feet
75 feet
Table 8:
220V, single-phase 20A circuit
25 feet
50 feet
75 feet
The following table lists the approximate equivalent wire gauge (AWG to Harmonized Cordage).
Table 9:
AWG
Harmonized, mm-mm
mm-mm = millimeter
squared
30A circuit
12 AWG 10 AWG
8 AWG 6 AWG
6 AWG 4 AWG
30A circuit
14 AWG 12 AWG
12 AWG 10 AWG
10 AWG 8 AWG
8
4.0
40A circuit
8 AWG
6 AWG
4 AWG
40A circuit
12 AWG
8 AWG
6 AWG
10
2.5
| Recommended AC power line sizes |
50A circuit
8 AWG
4 AWG
2 AWG
50A circuit
10 AWG
8 AWG
6 AWG
12
1.5
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