Appendix A. Recommended Power Line Sizes; Recommended Ac Power Line Sizes - IBM System Storage N3700 Hardware And Service Manual

Appendix A. Recommended power line sizes

This appendix discusses how to determine the power line lengths running from your
N3700 storage system to the power source.

Recommended AC power line sizes

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 your N3700 storage system and disk shelves, can often exceed 50 feet.
Note: Total AC wire length = breaker to wall or ceiling outlet + extension cable or
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).
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© Copyright IBM Corp. 2005, 2006
ceiling drop.
Table 18. 110V, single phase recommended conductor sizes
110V, single-phase 20A circuit
25 feet 12 AWG
50 feet 8 AWG
75 feet 6 AWG
Table 19. 220V, single phase recommended conductor sizes
220V, single-phase 20A circuit
25 feet 14 AWG
50 feet 12 AWG
75 feet 10 AWG
Table 20. American Wire Gage to Harmonized Cordage equivalents
AWG
1
Harmonized, mm-mm
mm-mm = millimeter squared
30A circuit 40A circuit
10 AWG 8 AWG
6 AWG 6 AWG
4 AWG 4 AWG
30A circuit 40A circuit
12 AWG 12 AWG
10 AWG 8 AWG
8 AWG 6 AWG
8 10
4.0 2.5
50A circuit
8 AWG
4 AWG
2 AWG
50A circuit
10 AWG
8 AWG
6 AWG
12
1.5
55