Wave soldering - components clearance

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http://forum.allaboutcircuits.com – Hi, I have a board with high density components. Altium designer have as default the components clearance (physical distance between components) as 10mils. In the same range 10-15mils, seems also in Orcad Cadence. Many documents on Internet from pcb designers/manufacturers recommend in case of wave soldering 50mils between components and worse case for some situation 30mils. What do you know about components clearance and wave soldering? I use mostly SMD components. I can hardly get 32mils between them, but that would be the maximum distance between them, otherwise will not fit on the boa (Embedded)