Safety
76 613768
9 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 or an accredited third-party certification agency for more
details.
9.1 North America (Required)
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 power supply UL report “Conditions of Acceptability” shall meet in the intended
application of the power supply in the end product.
• The supply must be recognized for use in Information Technology Equipment
including Electrical Business Equipment per UL 60950-1 First Edition. 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 performance), 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.
• Production hi-pot 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 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.
• 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=earth/chassis).
• The fan shall be protected by a guard to prevent contact by a finger in compliance
with UL accessibility requirements.
9.2 International (Required)
The vendor must provide a complete CB certificate and test report to IEC 60950-1.
The CB report must include ALL CB member country national deviations as appropriate
for the target market. All evaluations and certifications must be for reinforced
insulation between primary and secondary circuits.
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