Roberto, IPC-2221, Generic Standard on Printed Board Design, Table 6-1, Electrical Conductor Spacing, says: 171-250VAC (301-500VAC) - 1.25mm (2.5mm) - uncoated, sea level to 3050 m - 6.4mm (12.5mm) - uncoated, over 3050 m - 0.4mm (0.8mm) - permanent polymer coating, any elevation All figures are for externally run traces. Jerry -----Original Message----- From: Radaelli Roberto [mailto:[log in to unmask]] Sent: Wednesday, June 07, 2000 11:17 AM To: [log in to unmask] Subject: [TN] info about creepage distance hi to all i want to know the minimun distance between two trace on a standard fr4 material with a pollution level of 2 (from vde0110). the voltage is 230vac for the trace under the mains and 380vac for the power section in europe we look a table from CEI EN 60335-1 that say to use 1 mm every 100v for level 2 of pollution and 1 mm every 150v for 2 level is there similar for UL standard ? we make coffee machine and i look on the UL197 standard (table 28.1) that say a minimun distance of 4mm or 3.2mm for 126 to 250vac (in the U.S. we sell only single phase machine). thank's a lot roberto radaelli rancilio coffee machine e-mail [log in to unmask] <mailto:[log in to unmask]>