OK, I admit, i'm confused. trying to figure out clearance on a switching power tranformer using IEC 1010 according to Annex D2, D4.
120/240Vac input goes thru rectifier comes out at max 390 Vdc into switching tranformer. Assuming Overvoltage III and Pollution 2 using Table D.6 at 600V, clearance is 5.5mm. Paragraph D.2 allows for interpolation which would bring the 5.5 mm down some. But para. D.2 refers you to para D.4. The first sentence is straight forward bit the next sentence that begins with "However" is where my mind goes numb, and then to get referred to D.5 is the icing on the cake. So the question basically is - am I stuck using the 600V value from table D6 or can I interpolate a value between 300 and 600V on Table D6? thanks for any insight that may unstick my brain and get the blood circulating again. eric henn...@fp.com
