Electrical Clearances

[duki]

Does anyone know the IEC standard that establishes phase to phase and phase to earth clearances for electrical parts?

 

[motorspert]

Try BS4999 part 145 "General requirements for rotating electrical machines - specification for winding terminations".

This is written for motors and generators, but as Scotty would say "you canna change the laws of physics".

However, these assume a clean dry assembly ie in an IP54 box. Whereas for a transformer outdoors these would not really be acceptable.NEMA is written assumeing ventialted boxes and calls for massive clearences between phases

What do you need them for? This, potentially involves safet and you should make sure things are designed for the correct application.

Richard

 

[cuky2000]

Try IEC Std 71-2: Insulation Co-ordination Application Guide-- Part 2