Appendix C. Plug And Socket Types - Compaq 226824-001 - ProLiant - ML750 Basics Manual

Appendix C. Plug and socket types

The industry uses two primary connector standards: NEMA and IEC.
North America uses the NEMA standard. In the NEMA nomenclature for plugs and sockets (for
example, NEMA L6-30P or NEMA L5-30P):
• L means a twist-locking (as opposed to a push-in) connection
• 5 means rated up to 125V, 6 means rated up to 250V
• 15 means rated 15 amps, 20 means rated 20 amps, 30 means rated 30 amps
• P denotes (male) plug
• R denotes (female) socket
A new connector for use with NA PDUs for 50A single phase has been added. It is called a
CS8265c. And it is the equivalent to NEMA twist locks. The CS stands for California Standard but it
is available across the country.
For example, the designation NEMA L6-30P indicates a locking plug rated for up to 250 V and 30 A.
And NEMA L5-30P indicates a locking plug rated for 125 V and 30 A. Each of these is shown in
Figure C-1.
Figure C-1. Common plugs
NEMA L6-30P,
208 V, 30 A, 3 w
NEMA L5-30P,
125 V, 30 A 3 ph, 4 w
The other primary standard is the IEC standard. The IEC is a standards body in Geneva, Switzerland,
that defines the most common connectors: the IEC 320 general-purpose household connectors and the
IEC 309 industrial-grade connectors. The C13/C14 connectors are the 10-A power supply
connectors used on 90 percent of HP equipment. With all IEC 320 connectors, females (receptacles)
have odd numbers; males (plugs) have even numbers. The C19/C20 connectors are rated for 16 A.
Larger or higher power devices may require C19/C20 connectors if the input can exceed the 10-A
range. One example is the HP ProLiant DL580 G2 Server.
In the IEC nomenclature for plugs and sockets (for example, IEC-320 C19/20):
• C13/14 means 10-amp connectors (odd for female, even for male)
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