Hi Angus,
If you look in Annex P.2 of UL60950, a Class 2 power supply that complies
with UL 1310 is deemed to comply with the requirements of UL60950 for the
North American market. You do not need to do any further testing. A class 2
power supply is classed as an LPS (8A max). One thing to remember though
is that a Class 2 power supply only requires basic insulation between
primary and secondary, and most class 2 wall wart units are built this way.
Depending on what your equipment you should assess whether this is a
problem for your overall safety strategy. The class 2 power supply is a
different animal from a Class II power supply as defined in 60950.
Regards
Doug
Angus McGill
<[email protected] To:
"'[email protected]'" <[email protected]>
> cc:
Sent by: Subject: Power Adapter
LPS
owner-emc-pstc@majordom
o.ieee.org
05/07/03 04:13 PM
Please respond to Angus
McGill
I am choosing a UL1310 AC power adapter marked "Class 2 Transformer" for
its
output rating (12V, 1.0A), to sell with equipment that will be tested to
UL60950. What are the advantages to doing additional testing on the power
supply and marking it as "ITE LPS"? Would it help for UL's approval for
the
ITE equipment? Would it be just a matter of covering another edge in terms
of my company's liability? Thanks for your suggestions. (Power input to
the
ITE is fused at roughly 2x max normal operating current).
Angus McGill
Cascade Engineering Services, Inc.
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