Mechanical
30 Design Guide
4 Mechanical
This chapter contains mechanical guidelines that apply to desktop power supplies
regardless of form factor. For form factor specific design guides refer to Chapter 10
through Chapter 15.
4.1 Labeling and Marking - Recommended
The following is a non-inclusive list of suggested markings for each power supply unit.
Product regulation stipulations for sale into various geographies may impose additional
labeling requirements.
• Manufacturer information: manufacturer's name, part number and lot date code,
etc., in human-readable text and/or bar code formats.
• Nominal AC input operating voltages (100-127 VAC and 200-240 VAC) and current
rating certified by all applicable safety agencies.
• DC output voltages and current ratings.
• Access warning text (“Do not remove this cover. Trained service personnel only. No
user serviceable components inside.”) must be in English, German, Spanish,
French, Chinese, and Japanese with universal warning markings.
• PSU are required to label or tag Power Supply Design Guide revision compliance
level to reflect the timing supported. There are three levels of timing for T1 and T3
a power supply can support. This will help system integrators and end users know
the T1 and T3 timing that a power supply can support.
4.2 Connectors - Required
4.2.1 AC Connector
The AC input receptacle must be an IEC 320 type or equivalent. In lieu of a dedicated
switch, the IEC 320 receptacle may be considered the mains disconnect.
4.2.2 DC Connectors
Table 4-1 shows pin outs and profiles for typical power supply DC harness connectors.
The power supply requires an additional two-pin, power connector.
UL Listed or recognized component appliance wiring material rated min 85 °C, 300 VDC
shall be used for all output wiring.
There are no specific requirements for output wire harness lengths, as these are largely
a function of the intended end-use chassis, motherboard, and peripherals. Ideally,
wires should be short to minimize electrical/airflow impedance and simplify
manufacturing, yet they should be long enough to make all necessary connections
without any wire tension (which can cause disconnections during shipping and
handling). Recommended minimum harness lengths for general-use power supplies is
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