Brian,
You can easily avoid being concerned with the details of the test. When you
choose the PTC for your design, make sure you pick one that already has
component recognition/approval to IEC 60730-1. You will find that many of
them have UL and TUV component approval already. The PTC vendors typically
show the test mark approvals on their data sheets. You then can request a
copy of the certificate from the PTC manufacturer to verify that it is to
the proper version and clause(s) of the standard.
By using the recognized component, you avoid the component testing and
conditioning required in 60730-1. You may still have to perform testing on
the I/O pin to prove your design meets requirements at the connector but
that is much easier than the component level test.
Regards,
Gregory H. McClure
Lexmark Product Safety
859 232 3240 office
859 232 6882 fax
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"Kunde, Brian"
<brian_kunde@LECO
TC.COM> To
Sent by: <[email protected]>
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Subject
11/18/2009 11:36 PTC Test Requirements
AM
According to IEC/EN 60950 section 2.5b, a positive temperature coefficient
device (PTC) can be used to limit current for a limited power source
circuit.
It says the PTC has to “pass the test specified in IEC 60730-1, clauses 15,
17, J.15 and J.17”. I don’t have this standard. Can someone outline the
test requirements for me? I’m trying to avoid adding another standard to
our library unless we really need to.
Application: Sometimes we would like to supply 24Vdc to an I/O port to
operate a device outside the fire enclosure. I assume a PTC or Pico Fuse
can be used for this application. We drive the I/O circuit with a
programmable High-Side Driver programmed to 4 amps max but someone
suggested that we cannot rely on it for safety in this application. Any
other suggestions?
Thanks to all,
The Other Brian
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This message is from the IEEE Product Safety Engineering Society emc-pstc
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