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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
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</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> </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 =
<shop-talk-bounces@autox.team.net> <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> </o:p></p><p>It comes down to voltage =
drop. You generally don't want voltage drop of more than around =
5%.<o:p></o:p></p><p><o:p> </o:p></p><p>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.<o:p></o:p></p><p>300ft of 14ga cord will have a drop of =
around 6V. That's marginal.<o:p></o:p></p><p>12ga cord will have a =
drop of about 3.75V. 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> </o:p></p></div><div><p =
class=3DMsoNormal>J<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><o:p> </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> </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> </o:p></p></div><div><p =
class=3DMsoNormal>Thanks, <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </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> </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> </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> </o:p></pre></=
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_______________________________________________
Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk
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