In message
<blupr01mb147cbf5b34eed2c0c72b6f594...@blupr01mb147.prod.exchangelabs.com
>, dated Tue, 5 May 2015, Rick Busche <rick.bus...@qnergy.com> writes:
We manufacture a product that is intended for both the US and Canadian
markets in addition to the European community. Our wiring is currently
UL/CSA and ?harmonized?. Looking at the various wire vendors there are
UL/CSA & CE certifications and certifications that are UL/CSA, CE and
Harmonized. Is it acceptable to have wiring with just UL/CSA and CE?
I don't see how something can be CE yet not harmonized, with perhaps
exceptions for wire sizes used in only one or two European countries.
Also, I remember years ago a document or standard that stated that a
grounding wire could be smaller than the load wires. The argument was
that it doesn?t have to support the load but just fault the input
current. Does this sound familiar to anyone?
Present thinking is more or less opposite. The grounding wire must be of
low enough resistance to carry the supply's short-circuit current for
long enough to clear the protection device and not cause an unacceptable
rise in voltage on accessible parts. So for a low-power product, the
grounding wire might need to be much thicker than the load wires.
--
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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