I surprised it would have ever been 'code compliant' for building wiring. Its properties must have been well understood long ago.
Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: Monday, December 12, 2016 6:45 PM To: Ralph McDiarmid <[email protected]>; [email protected] Subject: RE: [PSES] aluminum vs copper wiring Even 1.5 is a bit optimistic. Data in BS 7671 on voltage drop gives values around 1.7 for the ratio, for the metals in the metallurgical conditions actually used in cables. Aluminium wires tend to deform under contact pressure, thus relaxing the pressure and raising the contact resistance. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Ralph McDiarmid [mailto:[email protected]] Sent: Monday, December 12, 2016 7:50 PM To: [email protected] Subject: Re: [PSES] aluminum vs copper wiring I've just come across this statement in a user manual for a small inverter product: "Do not use aluminum. It has about 1/3 more resistance than copper cable of the same size, and it is difficult to make good, low-resistance connections to aluminum wire" I think both statements are wrong. Science Data Book by Oliver&Boyd, lists resistivity of aluminum at about 1.5X that of copper. And, I don't see why electrical connections would be less reliable using aluminum, although, I do remember household wiring in the USA was done with Al some years ago with questionable success. Thoughts? Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric ________________________________ This message was scanned by Exchange Online Protection Services. ________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ ________________________________ This message was scanned by Exchange Online Protection Services. ________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
