Hello Zhang Guoqing:
You ask how to mark a product that has two sets
of power input terminals, one as the main input
and one as a backup input.
Each input, main and backup, should be separately
marked near the physical connection of each input.
Each marking would be the input for that specific
terminal, mains or backup, with the other terminal
disconnected.
The main terminal would be marked:
100-240 V ac, 5 A, 50-60 Hz.
The backup terminal would be marked:
100-240 V ac, 5 A, 50-60 Hz.
You also ask how to describe the markings in the
CB Report.
The CB Report should describe the markings as two,
independent markings, one for the main input and
one for the backup input. (Do not sum the currents
for the two inputs, as the product does not do this.)
You ask whether the power input rating must also be
on the same label that bears the manufacturer's name
and model number.
There is no requirement that all of the markings must
be on one label. The requirement is that the product
must bear the specified markings; they need not be
together on one label.
You ask whether you can use a single label with both
ac ratings and dc ratings to cover two different
products, i.e., an ac input product and a dc input
product.
As previously mentioned, the rating markings need
not be included in the manufacturer and model
identification label. Indeed, do not put both ac
and dc ratings on one product as this is very
confusing.
Best regards,
Rich
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