I think you did (answer your own question). The text you quote seems
surprisingly (and gratifyingly) lucid. Under 16 A use a 16 A CDN. Over
16 A up to 32 A, use a 32 A CDN.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-04-02 19:14, Richard Georgerian wrote:
Greeting colleagues,
Hopefully, someone in the PSTC group can correct my rational below and
enlighten me on the finer points of CDNs.
The discussion within our applications group is, shall the EUT current
rating be correctly matched to the CDN current rating? For example,
don’t use a CDN rated for 32 A for a EUT that is rated for 2 A, to
ensure that the correct Surge waveform will be applied to the EUT. I
cannot think of a good rational why a CDN rated for 32 A cannot be
used for a EUT rated for 2 A. We do understand that for the different
current ratings of CDNs, 16 A, 32 A, 63A and 125 A, the internal
components must have different values to meet the Surge waveform, for
Open circuit and Short circuit. However, testing Open circuit and
Short circuit on a CDN is without applying any currrent through the
CDN, so in effect, the Surge waveform for a 16 A CDN and a Surge
waveform for a 32 A CDN should have the same effect on a EUT drawing
only 2 A of current.
Probably two questions would help in trying to explain what our
discussion is about.
Must we use a CDN rated for 32 A, for products with a current rating
between 16 A and 32 A, to be considered being compliant to IEC
61000-4-5, for AC mains surge testing?
Must we use a CDN rated for 16 A, for products with a current rating
less than or equal to 16 A, to be considered being compliant to IEC
61000-4-5, for AC mains surge testing?
In the IEC 61000-4-5:2014, Section 7.3 Test setup for surges applied
to EUT power ports –
“The selection of the CDN specification from Table 4 shall be made to
match the current rating of the EUT (for example: an EUT rated at 5 A
shall be tested using a CDN complying with the
specifications of a 16 A rated CDN). Any higher current rated CDN can
be used if it meets the specification requirements in Table 4 for the
relevant lower current rating of the EUT (for
example: a CDN rated 64 A can be used for testing an EUT rated at 5 A,
if it meets the specification requirements of a 16 A rated CDN).”
So maybe I answered my questions.
Thank-you,
Richard Georgerian
Applications Engineer
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