In message <ce70d87f-e3f4-445a-ae92-cf136ea1f...@gmail.com>, dated Thu,
19 Feb 2015, Scott Xe <scott...@gmail.com> writes:
In both EN 60065 and EN 60950-1, the earth continuity is unclear to be
mandated for class 1 appliances. If it is not connected, it cannot be
expected to comply with this test.
It seems there is no clear requirements to define the class 1 appliance
as long as there is wiring of earth in the mains plug even though on
the other end of the mains cord does not connect to the circuitry of
the product. Needless to say the product must have double and/or
reinforce insulation system. Such product is still classified as class
I appliance.
I cannot agree. Class I products MUST pass the earth continuity test.
The Class of a product is not determined by what type of mains connector
it has, but by the protection requirements.
In IEC/EN 60065,Class I is formally defined; it is not unclear at all:
2.6.1
CLASS I
design in which protection against electric shock does not rely on BASIC
INSULATION only, but which includes an additional safety precaution in
such a way that means are provided for the connection of ACCESSIBLE
conductive parts to the protective (earthing) conductor in the fixed
wiring of the installation, in such a way that ACCESSIBLE conductive
parts cannot become HAZARDOUS LIVE in the event of a failure of the
BASIC INSULATION
Note 1 to entry: Such a design may have parts of CLASS II.
Class II is defined:
2.6.2
CLASS II
design in which protection against electric shock does not rely on BASIC
INSULATION only, but in which additional safety precautions, such as
DOUBLE INSULATION or REINFORCED INSULATION, are provided, there being no
provision for protective earthing or reliance upon installation
conditions
Do you not have your own copies of the standards you are working with?
This is usually regarded as a requirement for a manufacturer, to prove
that due care and attention has been applied to the safety assessment
process.
--
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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