What is the minimum distance between main voltages (PCB)

[ahmedadelhosni]

Hello,

I am trying to design my own power supply and I am a bit worry about the minimum distance between hot and neutral lines ? I read in this link that according to EN61010, it shall be 3mm.

Lots of people here do design there boards and I guess they have faced this issue before.

Thanks.

[sundberg84]

Hi!

It depends... http://creepage.com/

Example:
Insulation: Basic
Pollution Degree: 2
Material Group: IIIa or IIIb
Working Voltage: 250 Vrms or Vdc

Creepage is 2.5 mm or 98.4 mils

I try 3mm on my boards.

[GertSanders]

@ahmedadelhosni

In my DRU I use 100 mil clearance for AC lines (and 100 mil width).

[ahmedadelhosni]

@sundberg84 creepege differs from clearance. I guess if I add creepege then clearance can be decreased.

I just cant find online which values are the minimum. Most of the search results requests to buy the certificates.

[sundberg84]

@ahmedadelhosni Yes - sorry, didnt read carefull enough.