Dave, Maybe my original reply was a bit confusing. I covered the pollution issue to ensure that there was no conflict between the creepage and clearance values. However, Table 9 specifies test voltages only in terms of clearance dimensions, not creepage dimensions. Consequently, it is the clearance dimension for mains circuits from Table 4 that has to be transposed into Table 9 to find the hipot test voltage. Strictly speaking it is also necessary to make the altitude adjustment according to Table 10 depending on where your test facility is located. Best regards
Neil R. Barker CEng MIET FSEE MIEEE Manager Quality Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453571 Mob: (+44) 7801 723735 P Please consider the environment before printing this email. From: [email protected] [mailto:[email protected]] Sent: 22 February 2007 08:28 To: [email protected]; [email protected]; [email protected] Subject: RE: Hipot test levels for IEC 61010-1 products I have to disagree with Peter's interpretation. Table 4 quotes both clearance and creepage for mains circuits - Table 5 is for Circuits other than Mains Circuits (i.e. derived from mains circuits). Thus the clearance (for 230V) from Table 4 is 1.5 mm, but the creepage is 3 mm (for Group III) and as this is the larger of the two figures, this figure is used in Table 9, giving 2210 Vac or 3130 Vdc. And to complete the OP's questions - for a Class II device with double insulation para 6.8.4 states: The values for testing DOUBLE INSULATION or REINFORCED INSULATION are 1,6 times the values from table 9 for BASIC INSULATION giving a dc test voltage of 5008 Vdc. Or I mis-interpreting as well ?? Regards, Dave Coleman (AIIRSM) Product Compliance Officer and Health & Safety Officer EADS Test & Services (UK) Ltd. From: [email protected] [mailto:[email protected]] On Behalf Of Barker, Neil Sent: 22 February 2007 08:03 To: 'Peter Weichel'; [email protected] Subject: RE: Hipot test levels for IEC 61010-1 products Peter, Unfortunately it is not quite so simple as looking up Table 9. IEC 61010-1 takes into account Pollution degree and Material Group (of the insulation). You need to start there to determine what creepage and clearance must be allowed for the Pollution degree that your equipment is expected to operate in. Pollution is an all-embracing term for dust and dirt of all types that may accumulate on surfaces. Pollution degree 1 includes no pollution or only dry, non-conductive pollution that has no effect on the performance of the insulation. This might apply to equipment for use in a 'clean' laboratory with climate control or if the equipment itself is sealed. Pollution degree 2 is where normally only non-conductive pollution occurs, but where temporary conductivity caused by condensation must be expected. This might be an uncontrolled laboratory, electronics workshop, or 'office-like' environment. Pollution degree 3 is where conductive pollution occurs or dry, non-conductive pollution occurs which becomes conductive due to condensation which is expected. This might be something like a factory environment. Now, if we assume Pollution degree 2 and take the worst case material Group (III), Table 4 tells us that the required creepage distance for Mains Circuits operating at 230Vrms is 3.0mm or 1.5mm on printed wiring boards. Table 5 tells us that for a working voltage of up to 300Vrms and a mains voltage of 230Vrms the required clearance is 0.94mm. This is considerably less than the creepage distance, so we will use that. Now, table 9 tells us that for a clearance of 1.0mm, the test voltage should be 1060Vrms or 1500Vpk or Vdc. Given the probability of Class Y capacitors in the mains circuit, a dc test at 1500V would probably be the best choice. I hope this helps. Best regards Neil R. Barker CEng MIET FSEE MIEEE Manager Quality Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453571 Mob: (+44) 7801 723735 P Please consider the environment before printing this email. -----Original Message----- From: Peter Weichel [mailto:[email protected]] Sent: 21 February 2007 19:21 To: [email protected] Subject: Hipot test levels for IEC 61010-1 products Hi Experts, Could someone please help on how to select test voltage for hipot (dieletric) testing for products in the scope of IEC 61010-1. The product is mains supplied from 230V AC it´s Class I apparatus. It should be using table 9 (basic isolation) but which level to select i find a bit confusing. Which table must be used for Class II apparatus with same power supply ? Best regards Peter Electroware ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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