Hi Richard,
I am a committee member of SC62A / WG14 who drafted the IEC 62353. Feel free to contact me if you want to discuss any querries you have regarding this standard. As for your comment on 10% as per IEC 61557-1, when using higher current eg 10A/25A on the current safety analysers (Rigel / Fluke / Metron) you will be able to meet the accuracy.(note that the mentioned spec on the datasheet is worst case and does not reflect the actual accuracy of a calibrated unit hence the recommendation of manufacturers for annual calibrations.) Rigel adjust their safety analysers to within 1 digit at 0.20 Ohm which is 5%. This is by far more than required as moving the croc clic - often used) or using a 4 mm probe in the earth eq.pot. point give appr. 0.02 - 0.05 difference due to bulk resistance. (see my presentation at IPEM / June 06)
Hope this clarifies a little
Thanks
