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connecting top and bottom copper pour

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coolman21

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On a four layer board after the board has been layed out. should a copper pour be used be used to fill the void area's (top/bottom)
Should the pour be tired to gnd? Can via's be used to tie the two pours together?

What rules should be followed?

Cool
 

Depends on the usage of PCB. Pouring copper on unused outer layers is good if you ensure there are no islands or thin threads of Ground between empty space between components. For best use of tehse copper pours you must tie them together using plated thru-hole (PTH) vias. Run very strict DRCs in your CAD tool to ensure you are not forming unconnected pieces / floating copper on outer layers, or very thin strands of ground copper.
 

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