If you do not understand what a 'Class 2' power source
is, you probably should not be doing any sort of
evaluation of safety requirements.
For IT equipment, a Class 2 source is supposed to
provide limited voltage, current, and power under both
normal and some fault conditions. Electrical codes have
other requirements for class 2 sources and associated
wiring, depending on the intended end use.
Also, for use in North America, there are other
agencies, such as TUV Rhineland and CSA, that will
provide prompt and cost-effective safety *****sment and
certification services.
harold@[EMAIL PROTECTED]
wrote:
> Thanks for the response! I'm not quite sure what "class 2" is. Is it
> electrical shock resistance (perhaps double insulation and a high
> hipot test) or fire resistance (over temperature shutdown or similar),
> or power output limit (limiting fire creation capability of connected
> equipment), or some or all? I'm just looking for ways to reduce the
> testing costs for UL listing of a device. I heard my employer was
> charged $16k to test a device with a UL listed power supply, UL listed
> power inlet/line filter, and UL listed power switch. Everything else
> was low voltage on the power supply output. I understand that each of
> these components must be used within their limits (there was a
> question as to whether the power switch would handle the power supply
> inrush current). But, I look at a typical PC power supply that has all
> the line connected components sealed in the box. If we were to use
> something like that (but down in the 50W area), would it decrease our
> testing costs? If so, who makes supplies like that (that would just
> stick out our rear panel and provide us with "safe" DC inside the
> box)?
>
> What else can we do to reduce testing costs?
>
> THANKS!
>
> Harold
|
