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PCB voltage trace clearance for 400VDC

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pha0001m

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Hi guys,

What is the PCB voltage trace clearance for 400VDC with respect to 0V?

A quick search on Google point to 2.5mm from IPC_2221A standard.

Could someone confirm this?
 

You are correct. that is for outer layer of PCB. For traces running on internal layers this clearance will be lower. With conformal coating on the outer layer, the clearance will also come down.
For quick reference check this out.
https://www.smps.us/pcbtracespacing.html
It has embedded calc in the webpage.
 
If you have the room for it on the board, then choose the clearance far higher than the minimum. Cracks in the board caused by temperature shocks or excessive stress may reduce insulation effectiveness over time.
 

So it not going to be in very harsh conditions... Will have to re-read the spec to get pollution level
If the board develops cracks you are going to be the unluckiest designer in the world.... because it would be the layer to layer clearances that would be affected and if you have high voltages then the design should be done so that cracks etc. do not appear or your design is dangerous..... never had that problem myself.
 

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