Rosebud: Refer to Figure 3-4 in IPC-D-275. We are currently having discussions as to why there is a big discrepancy between IPC-D-275's (MIL-STD-275) and the NEC's direction on how much current a copper conductor can carry. However, IPC-D-275 is an excellent design standard so definitely use it. Regards, John Kretsch, P.E. Engineer, Design Assurance ADC Video Systems [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Unidentified subject! Author: [log in to unmask] at internet-mail Date: 04/12/96 10:57 As we are moving into higher power requirements for some of our = products, I was hoping someone could help me with the trade offs of = plating FR4 at higher copper thicknesses. How much current can each oz = carry for various widths? Any assistance would be appreciated. = -Rosebud