Hello Doug, Be careful about implying that a battery keeps a system from having transients. With high currents and long wires you can get big inductive spikes. For example, a vehicle has a big battery and also has a long list of nasty transients.=20 Best regards, John =20 --------------------------------------- The information in this email and attachments hereto may contain legally = privileged, proprietary or confidential information that is intended for = a particular recipient. If you are not the intended recipient(s), or the = employee or agent responsible for delivery of this message to the = intended recipient(s), you are hereby notified that any disclosure, = copying, distribution, retention or use of the contents of this e-mail = information is prohibited and may be unlawful. When addressed to Takata = customers or vendors, any information contained in this e-mail is = subject to the terms and conditions in the governing contract, if = applicable. If you have received this communication in error, please = immediately notify us by return e-mail, permanently delete any = electronic copies of this communication and destroy any paper copies. --------------------------------------- -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Powell, Doug Sent: Friday, September 08, 2006 9:06 AM To: sreekanthn@xxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Voltage & Prepeg thickness Sreekanth, The best way to do this is to refer to the voltage impulse tables in IEC 60664-1 and determine the impulse rating required for your 1kV working voltage. Then divide the V/mil rating into that number. =20 Simply dividing the 1000 volts by the V/mil rating of the prepreg is risky at best because all electrical products experience voltage impulses unless on a battery supply. -doug -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Sreekanth N nampoothiri Sent: Thursday, September 07, 2006 10:54 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Voltage & Prepeg thickness Hi All, =20 What could be the rule of thumb while designing a multilayer board with HighVoltage. For eg:- If I have 1KV in one layer, what could be the required minimum prepeg thickness to the next layer?=20 And what could be the voltage & current carrying capacity of FR4 . =20 BestRegards, Sreekanth N Nampoothiri =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 -- Attached file included as plaintext by Ecartis -- This message, including any attachments, may contain information that is confidential and proprietary information of Advanced=20 Energy Industries, Inc. The dissemination, distribution, use=20 or copying of this message or any of its attachments is=20 strictly prohibited without the express written consent of=20 Advanced Energy Industries, Inc. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu