We received compliant test reports issued by accredited test houses from the suppliers. Looking at the test results, the product actually constructed as class II as the insulation resistance is greater than 4 M ohms, the dielectric strength test at 3,000 Vac and no test for earth continuity. The accessible metal part is the secondary output of external power supply. The EPS is housed in a fully sealed plastic box. It is qualified to be class II as per 2.6.2. However the product is classified as class I on the front page of the test report.
The mains input is employed a 3-core mains cordset and 3-pin detachable connectors on one side of mains cord and the other side of main unit. Only this section may meet 2.6.1 but the earth path ends at the mains inlet of main unit due to earth pin is left unconnected. Probably it is a challenge to the test houses to determine class II and thus class I. The unit itself should meet the safety requirements but constructed abnormally. Scott > On 19 Feb, 2015, at 11:46 pm, John Woodgate <j...@jmwa.demon.co.uk> wrote: > > 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 > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
