Doug,
I have used DC-DC power supply with the AC fuse on the PSU in our products
many times and have never heard such a saga from an agency. The PSU report
will certainly have C of A and in addition to that almost all test houses
when testing DC-Dc power supply which is fitted with AC fuse, they will
conduct certain abnormal tests to ensure that fuse does what it is supposed
to do and will list all the fuses that were used during the testing. In fact
UL PAG 1950 has one particular clause about such thing and will allow the PSU
manufacturer to use AC fuse on a DC-DC PSU provided certain conditions are
met.
I suggest you go back to the top management and demand that they show the
clause of the standard where it says this practice is not acceptable. If you
look at most fuse catalogues, you will notice that many of the fuses even
though they are rated for AC, they have also been test for DC and fuse
manufacturers would confirm this.
Don't give up and demand full explanation. It seems to me that your product
certification engineer is either have not enough experience or he is after
promotion.
Thanks
Peter
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