Dear Phil and Gary, Thank you for both of you You are right .When I've asked about this,I told that we want some safty factor for surge current , so should I calculate the trace width depending on the maximum current value may be take place due to surge current, or there is another way to calculate it? Thanks in advance Regards, Amira Mohamed PCB Designer IEP www.bahgat .com > ---------- > From: Gary Ferrari[SMTP:[log in to unmask]] > Reply To: DesignerCouncil E-Mail Forum.;[log in to unmask] > Sent: Monday, February 26, 2001 4:21 AM > To: [log in to unmask] > Subject: Re: [DC] Trace width > > Amira, > > I tend to agree with Phil on this one. The 5 amp current should be a > continuos value. Is there any possiblilty that you may be seeing a surge > current of a much larger value when you turn on the circuit? > > Regards, > > Gary Ferrari > Executive Director > IPC Designers Council > 860-350-9300 > Fax 413 771-5386 > [log in to unmask] > --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------