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Darryl,<div>thank you for that! i've often wondered myself where the 110/220 and other random voltages mentioned from time to time came from (as opposed to 120/240 which is all i've worked with in my electrical career). i've often assumed that the other numbers were grandfathered in from other systems, but was never really sure.</div><div><br></div><div>If the change to 120/240 was in the 60's then why do some appliances still reference 110-115V?</div><div><br></div><div>i'm impressed, it must have been something working your electrical career thru, among other things, the change from DC utility systems to AC systems<br><br></div><div>benn<br><span class="ecxecxecxecxEC_Apple-style-span" style="color:rgb(0, 32, 96)"><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">DayStar Renewable Energy Inc. </font></span><div><div><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">benn@daystarsolar.ca</font></div><div><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">780-906-7807 </font></div><div><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">HAVE A SUNNY DAY
</font></div><div><br></div></div><br><br><br><br><hr id="stopSpelling">Date: Tue, 19 Oct 2010 10:49:26 -0700<br>From: daryl_solar@yahoo.com<br>To: re-wrenches@lists.re-wrenches.org<br>Subject: Re: [RE-wrenches] AC voltage in North America<br><br><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit"><div>Thanks Joel</div>
<div>When I first started working most of the city was DC and we had a lot of work tearing out DC motors and putting in AC motors. <br><br>--- On <b>Tue, 10/19/10, Joel Davidson <i><joel.davidson@sbcglobal.net></i></b> wrote:<br></div>
<blockquote style="border-left:rgb(16,16,255) 2px solid;padding-left:5px;margin-left:5px"><br>From: Joel Davidson <joel.davidson@sbcglobal.net><br>Subject: Re: [RE-wrenches] AC voltage in North America<br>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><br>Date: Tuesday, October 19, 2010, 11:24 AM<br><br>
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<div><font size="2" face="Arial">Hello Darryl,</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">I tip my hat in honor to your many years working with electricity. </font><font size="2" face="Arial">110 volts was Edison's choice for direct current. Then Tesla/Westinghouse chose higher voltage alternating current stepped down to 120 volts. See <a href="http://en.wikipedia.org/wiki/War_of_Currents" rel="nofollow" target="_blank">http://en.wikipedia.org/wiki/War_of_Currents</a> 115-volt AC/DC universal motors in drills and other tools were fairly common until low-cost induction motors became widespread.</font></div>
<div><font size="2" face="Arial"></font> </div>
<div><font size="2" face="Arial">Best regards,</font></div>
<div><font size="2" face="Arial">Joel Davidson</font></div>
<div><font size="2" face="Arial"></font> </div>
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<div style="font:10pt arial">----- Original Message ----- </div>
<div style="font:10pt arial;background:#e4e4e4"><b>From:</b> <a title="daryl_solar@yahoo.com" href="http://us.mc519.mail.yahoo.com/mc/compose?to=daryl_solar@yahoo.com" rel="nofollow" target="_blank">Darryl Thayer</a> </div>
<div style="font:10pt arial"><b>To:</b> <a title="re-wrenches@lists.re-wrenches.org" href="http://us.mc519.mail.yahoo.com/mc/compose?to=re-wrenches@lists.re-wrenches.org" rel="nofollow" target="_blank">RE-wrenches</a> </div>
<div style="font:10pt arial"><b>Sent:</b> Monday, October 18, 2010 7:18 PM</div>
<div style="font:10pt arial"><b>Subject:</b> Re: [RE-wrenches] AC voltage in North America</div>
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<div>When I was an electrical apprentus back in the late 40's we called it 110/220 then in the fifties the voltage was reised to 115/230 and some time in the 1960 it was raised to 120 240 </div>
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<div>Darryl<br><br>--- On <b>Mon, 10/18/10, Marco Mangelsdorf <i><<a href="http://us.mc519.mail.yahoo.com/mc/compose?to=marco@pvthawaii.com" rel="nofollow" target="_blank">marco@pvthawaii.com</a>></i></b> wrote:<br></div>
<blockquote style="border-left:rgb(16,16,255) 2px solid;padding-left:5px;margin-left:5px"><br>From: Marco Mangelsdorf <<a href="http://us.mc519.mail.yahoo.com/mc/compose?to=marco@pvthawaii.com" rel="nofollow" target="_blank">marco@pvthawaii.com</a>><br>Subject: [RE-wrenches] AC voltage in North America<br>To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org><br>Date: Monday, October 18, 2010, 8:27 PM<br><br>
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<p class="ecxyiv61989054yiv1671298692MsoNormal">I just don’t understand it.</p></div></div>
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</p><p class="ecxyiv61989054yiv1671298692MsoNormal">Lots of people—from reporters to homeowners—consistently refer to the AC voltage in their homes as “110/220.”
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<p class="ecxyiv61989054yiv1671298692MsoNormal">Where does this come from?
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<p class="ecxyiv61989054yiv1671298692MsoNormal">If North American utilities were putting out power at that voltage range, they would be in serious trouble.
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<p class="ecxyiv61989054yiv1671298692MsoNormal">Anyone able to educate me on this matter?
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<p class="ecxyiv61989054yiv1671298692MsoNormal">marco
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