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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector
Version 2.0
37
5 Safety
The following subsections outline sample product regulations requirements for a typical power supply. Actual
requirements will depend on the design, product end use, target geography, and other variables. Consult
your company’s Product Safety and Regulations department for more details.
5.1 North America
The power supply must be certified by an NRTL (Nationally Recognized Testing Laboratory) 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 60950, 3rd edition, 2000. The certification must include external enclosure
testing for the AC receptacle side of the power supply.
• The supply must have a full complement of tests conducted as part of the certification, such as input
current, leakage current, hi-pot, 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 the
above-mentioned standard.
100% production HiPot testing must be included and marked as such on the power supply enclosure.
There must not be unusual or difficult conditions of acceptability such as mandatory additional cooling or
power de-rating. 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.
The power supply must be evaluated for operator-accessible secondary outputs (reinforced insulation) that
meet the requirements for SELV and do not exceed 240 VA under any condition of loading.
The proper polarity between the AC input receptacle and any printed wiring boards connections must be
maintained (that is, brown=line, blue=neutral, and green or green/yellow =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 the IEC 60950 3rd ed., 1999
Specification.
5.2 International
The vendor must provide a complete CB certificate and test report to IEC 60950: 3rd ed., 1999 . The CB
report must include ALL CB member country national deviations. CB report must include evaluation to EN
60950: 2000. All evaluations and certifications must be for reinforced insulation between primary and
secondary circuits.