EN 60664-1 / VDE 0110-1

EN 60664-1 / VDE 0110-1 are the cornerstones of insulation coordination for equipment used in low-voltage installations. This applies to all equipment that is rated for use up to 2,000 meters above sea level. Above 2,000 meters above sea level height correction factors come into play.
The tables below from EN 60664-1 (VDE 0110/1):2008-01 are reproduced here for the relevant registered limited press run and via permit no. 072.010 issued by Deutsches Institut für Normung e.V. (DIN) and VDE Verband der Elektrotechnik Elektronik Informationstechnik e.V. The relevant standards are applied in accordance with the latest version obtainable from VDE Verlag GmbH, Bismarckstr. 33, 10625 Berlin and Beuth Verlag GmbH, Burggrafenstr. 6, 10787 Berlin.