[PCB_FORUM] Creepage verse Clearance

  • From: Jim Goshorn <jgoshorn@xxxxxxx>
  • To: icu-pcb-forum@xxxxxxxxxxxxx
  • Date: Mon, 14 Mar 2005 14:30:32 -0600

Our standard DRC clearance are checked perfectly with a line of sight type calculation within
the Allegro tool. But while working on high voltage type boards a curve ball is thrown at us, not
only do we have to maintain certain clearances but we also have maintain a higher number sometimes
referred to as Creepage. This can be twice the size as clearance and because we are working
in a limited size board we often accomplish this by adding slots into the board to satisfy the UL and CE
type regulations. Has anyone come up with a clever way to have Allegro meet both of these requirements
and not have to compromise the database rules.

Jim Goshorn
MCL, Inc
501 S Woodcreek Rd
Bolingbrook, IL 60440
630-771-7205

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