In message <052386ecbaec46bb9a46af06a46b1...@sehste15d1be4.hs20.net>,
dated Mon, 17 Nov 2014, Charlie Blackham <char...@sulisconsultants.com>
writes:
The NRTL insist on short-circuiting the single 560R current limiting
resistor and I am unable to find any evidence that thick-film or
thin-film surface mount resistors can fail short-circuit as they appear
to fail open-circuit
They are citing the standard, which doesn't have an exception for not
shorting SM resistors. It's probably too late to take them into account
in 60950-1, but this should be considered for 62489-1, if it hasn't been
already. Will the resistor manufacturers give assurances that S/C
failures do not occur?
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
When I turn my back on the sun, it's to look for a rainbow
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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