> -----Original Message----- > From: Herbert Graf [SMTP:mailinglist@FARCITE.NET] > Sent: Sunday, April 27, 2003 11:36 PM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [OT] Saftey issues: AC vs DC > > > Mike Singer wrote: > > > Bob Ammerman wrote: > > > > DC is used for very high voltage (1 MVolt+!) long > > > > distance power transmission. For one thing, it > > > > avoids the skin effect. > > > > > > Could you, please, estimate the depth of a skin > > > effect in copper lines at 60Hz AC. > > > > http://www.circuitcellar.com/library/eq/153/3.htm > > Thanks, I didn't feel like pulling out my E&M text... :) 20mm? > Wow, that's > worse then I thought, I thought at least an inch. TTYL > > The way I read that, a cable 40mm in diameter would suffer no extra losses through skin effect at 60HZ. I wouldn't have thought that long distance transmission lines were much thicker than 40mm? Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= Any questions about Bookham's E-Mail service should be directed to postmaster@bookham.com. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics