Hi All, In line with the Stamp and PIC mains safety thread I am posting the following information. Looking in the back of my powerbox (TM) catalogue I found a list of standards that make for good reading when designing for mains operation. Some of the standards that are mentioned are/will be superceeded but have essentially the same information with perhaps a few value changes. The catalogue itself also includes about 4 pages of interesting reading at the back (whence these standards numbers). VDE 0806 UL 478 CSA 22.2 No. 154 IEC 380 BS 5850 IEC 435 BS 6204 IEC 950 UL 1950 CSA 950 EN 60950 BS 7002 Current EN 41003 BS 6301 IEC 601 UL 544 CSA 125 VDE 0705 Medical Powerbox International AB Sweden +46 (158) 70-300 Powerbox Inc. Boulder CO USA +1 (303) 444-1461 Cheers -- Kalle Pihlajasaari kalle@ip.co.za http://www.ip.co.za/ip Interface Products P O Box 15775, DOORNFONTEIN, 2028, South Africa + 27 (11) 402-7750 Fax: 402-7751 http://www.ip.co.za/people/kalle DonTronics, Silicon Studio and Wirz Electronics uP Product Dealer