Intel ATX Power Supply Design Guide
Version 0.9
8. Safety Requirements
8.1 North America
The power supply must be certified by UL or CSA for use in the USA and Canada under the following conditions:
∙The supply must be Recognized for use in Information Technology Equipment including Electrical Business Equipment per UL 1950, 3rd edition, without D3 deviations and CAN/CSA C22.2 no.
∙The supply must have a full complement of tests conducted as part of the certification, such as input current, leakage current, hipot, temperature, energy discharge test, transformer output characterization test (open circuit voltage, short circuit current and maximum VA output), and abnormal testing (to include stalled fan tests and voltage select switch mismatch).
∙The enclosure must meet fire enclosure mechanical test requirements per clauses 2.9.1 and 4.2 of UL 1950, 3rd edition.
The supplier must supply the complete certification report including a test record. Production hipot testing must be included as a part of the certification and indicated as such in the certification report.
There must not be unusual or difficult conditions of acceptability such as mandatory additional cooling or power derating. The insulation system shall not have temperatures exceeding their rating when tested in the end product.
The certification mark shall be marked on each power supply.
A list of the minimum temperature ratings of all AC mains connected components and the printed wiring board(s) shall be provided. The power supply must be evaluated for
The proper polarity between the AC input receptacle and any printed wiring boards connections must be maintained (i.e., brown=line, blue=neutral, green=earth/chassis).
Failure of any single component in the fan speed control circuit shall not cause the internal component temperatures to exceed the abnormal fault condition temperatures per IEC 950.
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