EN 61558-1:1997 Safety of Power Transformers, Power Supply Units and Similar - Part 1: General Requirements and Tests (Incorporates Amendments A1: 2002 and A11: 2003; Remains Current)
2005EN 61558-1:2005 Safety of power transformers, power supplies, reactors and similar products Part 1: General requirements and tests (Incorporates Amendment A1: 2009; Incorporating corrigendum August 2006)
1997EN 61558-1:1997 Safety of Power Transformers, Power Supply Units and Similar - Part 1: General Requirements and Tests (Incorporates Amendments A1: 2002 and A11: 2003; Remains Current)