shop-talk
[Top] [All Lists]

Re: [Shop-talk] Extension cord length vs. wire gauge

To: <shop-talk@autox.team.net>
Subject: Re: [Shop-talk] Extension cord length vs. wire gauge
From: "Neil Sherry" <neiljsherry@talktalk.net>
Date: Wed, 31 Oct 2018 08:40:01 -0000
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <CAK73_u6_tAMQw==bu3A2hS2EFNrzW+DDg-y_AGdDzOfQ0awLqQ@mail.gmail.com> <9043b31f-710f-09e5-4a38-8efb4078f33e@sackheads.org>
Thread-index: AQGvzywwwBKORr2OFQ8V3StkRwOBdgMAWB4KpWpINtA=
This is a multipart message in MIME format.

--===============1976059436874122150==
        boundary="----=_NextPart_000_009F_01D470F5.50598710"
Content-Language: en-gb

This is a multipart message in MIME format.

------=_NextPart_000_009F_01D470F5.50598710
        charset="utf-8"
Content-Transfer-Encoding: quoted-printable

Comes back to =E2=80=98will it work=E2=80=99 which will depend on the =
device. In some places the utility companies are reducing line voltages =
to save energy =E2=80=93 and stuff still works.

Only issue with the 40W dissipation would be if the cable was still =
coiled up =E2=80=93 then it would build up, melt the insulation and be a =
hazard. Over 300 feet the heat per foot would be negligible =E2=80=93 in =
fact more or less the same as it would be whatever the length of cable =
(actually a bit less, as the current is less due to the combined =
resistance).

Neil

=20

From: Shop-talk <shop-talk-bounces@autox.team.net> On Behalf Of Jimmie =
Mayfield
Sent: 31 October 2018 02:56
To: shop-talk@autox.team.net
Subject: Re: [Shop-talk] Extension cord length vs. wire gauge

=20

It comes down to voltage drop.  You generally don't want voltage drop of =
more than around 5%.

=20

At 4 amps, a 100ft 16ga cord is going to have a voltage drop of about =
3.5V.  This is okay.  At 300ft, the voltage drop will be about 9.5V.  =
That's unacceptable.  Assuming your equipment still functions, your cord =
would be dissipating around 40W of heat due to internal resistance.

300ft of 14ga cord will have a drop of around 6V.  That's marginal.

12ga cord will have a drop of about 3.75V.  That's okay.

So go with 12ga cord.=20

=20

J

=20

=20

On 10/30/18 15:54, Scott Hall wrote:

Guys,=20

=20

I need about 300 get of extension cord. 16 AWG was fine at 100 ft. Can I =
string 3 of those together without a problem, or should I go up a size? =
Draw is 4 amps.

=20

Thanks,=20

=20

Scott





_______________________________________________
=20
Archive: http://www.team.net/pipermail/shop-talk
=20
http://autox.team.net/mailman/options/shop-talk/mayfield+shoptalk@sackhea=
ds.org
=20

=20


------=_NextPart_000_009F_01D470F5.50598710
        charset="utf-8"
Content-Transfer-Encoding: quoted-printable

<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml"; =
xmlns=3D"http://www.w3.org/TR/REC-html40";><head><meta =
http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta =
name=3DGenerator content=3D"Microsoft Word 15 (filtered =
medium)"><style><!--
/* Font Definitions */
@font-face
        {font-family:"Cambria Math";
        panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
        {font-family:Consolas;
        panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin:0cm;
        margin-bottom:.0001pt;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;
        color:black;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:blue;
        text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
        {mso-style-priority:99;
        color:purple;
        text-decoration:underline;}
pre
        {mso-style-priority:99;
        mso-style-link:"HTML Preformatted Char";
        margin:0cm;
        margin-bottom:.0001pt;
        font-size:10.0pt;
        font-family:"Courier New";
        color:black;}
p.msonormal0, li.msonormal0, div.msonormal0
        {mso-style-name:msonormal;
        mso-margin-top-alt:auto;
        margin-right:0cm;
        mso-margin-bottom-alt:auto;
        margin-left:0cm;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;
        color:black;}
span.HTMLPreformattedChar
        {mso-style-name:"HTML Preformatted Char";
        mso-style-priority:99;
        mso-style-link:"HTML Preformatted";
        font-family:"Consolas",serif;
        color:black;}
span.EmailStyle21
        {mso-style-type:personal-reply;
        font-family:"Calibri",sans-serif;}
.MsoChpDefault
        {mso-style-type:export-only;
        font-size:10.0pt;}
@page WordSection1
        {size:612.0pt 792.0pt;
        margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
        {page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite =
lang=3DEN-GB link=3Dblue vlink=3Dpurple><div class=3DWordSection1><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Comes back =
to =E2=80=98will it work=E2=80=99 which will depend on the device. In =
some places the utility companies are reducing line voltages to save =
energy =E2=80=93 and stuff still works.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Only issue =
with the 40W dissipation would be if the cable was still coiled up =
=E2=80=93 then it would build up, melt the insulation and be a hazard. =
Over 300 feet the heat per foot would be negligible =E2=80=93 in fact =
more or less the same as it would be whatever the length of cable =
(actually a bit less, as the current is less due to the combined =
resistance).<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Neil<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Shop-talk =
&lt;shop-talk-bounces@autox.team.net&gt; <b>On Behalf Of </b>Jimmie =
Mayfield<br><b>Sent:</b> 31 October 2018 02:56<br><b>To:</b> =
shop-talk@autox.team.net<br><b>Subject:</b> Re: [Shop-talk] Extension =
cord length vs. wire gauge<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p>It comes down to voltage =
drop.&nbsp; You generally don't want voltage drop of more than around =
5%.<o:p></o:p></p><p><o:p>&nbsp;</o:p></p><p>At 4 amps, a 100ft 16ga =
cord is going to have a voltage drop of about 3.5V.&nbsp; This is =
okay.&nbsp; At 300ft, the voltage drop will be about 9.5V.&nbsp; That's =
unacceptable.&nbsp; Assuming your equipment still functions, your cord =
would be dissipating around 40W of heat due to internal =
resistance.<o:p></o:p></p><p>300ft of 14ga cord will have a drop of =
around 6V.&nbsp; That's marginal.<o:p></o:p></p><p>12ga cord will have a =
drop of about 3.75V.&nbsp; That's okay.<o:p></o:p></p><p>So go with 12ga =
cord. <o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>J<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>On 10/30/18 15:54, Scott Hall =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal>Guys, <o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
need about 300 get of extension cord. 16 AWG was fine at 100 ft. Can I =
string 3 of those together without a problem, or should I go up a size? =
Draw is 4 amps.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thanks,&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Scott<o:p></o:p></p></div></div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><pre>___________________________=
____________________<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre><a =
href=3D"mailto:Shop-talk@autox.team.net";>Shop-talk@autox.team.net</a><o:p=
></o:p></pre><pre>Donate: <a =
href=3D"http://www.team.net/donate.html";>http://www.team.net/donate.html<=
/a><o:p></o:p></pre><pre>Suggested annual donation=C2=A0 =
$12.96<o:p></o:p></pre><pre>Archive: <a =
href=3D"http://www.team.net/pipermail/shop-talk";>http://www.team.net/pipe=
rmail/shop-talk</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Unsu=
bscribe/Manage: <a =
href=3D"http://autox.team.net/mailman/options/shop-talk/mayfield+shoptalk=
@sackheads.org">http://autox.team.net/mailman/options/shop-talk/mayfield+=
shoptalk@sackheads.org</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre></=
blockquote><p><o:p>&nbsp;</o:p></p></div></body></html>
------=_NextPart_000_009F_01D470F5.50598710--


--===============1976059436874122150==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk



--===============1976059436874122150==--


<Prev in Thread] Current Thread [Next in Thread>