Using 3 X 110V 15A Extension Cords For 250V 50A Outlet - Electrical - DIY Chatroom Home Improvement Forum
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Old 11-13-2017, 11:17 PM   #1
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Using 3 x 110V 15A extension cords for 250V 50A outlet


I was trying to find a 50-100 foot extension cord for a NEMA 10-30P 50AMP (Dryer) outlet with no luck, plus I am sure they are several hundred dollars for that length. I need to power a few computers that are running at 1400W and accept 110V-240V on the power supply.

My first thought is to get this adapter =
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

to convert it to a standard NEMA 5-15P outlet. Then add one of these =
https://www.homedepot.com/p/GE-3-Out...4541/203742102

Followed by 3 x 100 foot 12 gauge 15AMP extension cords:
https://www.homedepot.com/p/Husky-10...0H31/205377755

Then plug in one computer at the end of each extension cord.

I am thinking that logically this would work since the current is distributed throughout the 3 cords however the grounded 3 outlet splitter is only rated for 15AMP's and would be taking a 45 AMP load so I may need to find a better splitter. Anyone know any options?

Let me know if you guys think this would work providing I get a better splitter or if another solution would be more practical, purhaps buying a NEMA 10-30P plug instead and building an extension cord but would still need a way to split it into 3.

Also would the 250V cause issues going into the 110-240V computer power supply?

Last edited by trialanderror; 11-13-2017 at 11:19 PM. Reason: added links
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Old 11-14-2017, 01:08 AM   #2
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


Problem = "Combined load must be less than 15 amps or 1875 watts "

And you want three times that ?

Said adaptor will never carry the load !


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Old 11-14-2017, 01:20 AM   #3
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


I would hope that a "normal" 5-15 plug (or adapter) would NOT fit (could not be made to fit) into a 14-50 socket, since a device expecting 120 V might then be connected to 240 V ! !

If it does fit, your proposed set-up would have no Ground on the Ground Pin, since the 10-30 socket supplies a Neutral but no Ground.
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Originally Posted by trialanderror View Post
would the 250V (sic) cause issues going into the 110-240V computer power supply?
YES, if the power supply were switched to 110 V
NO, if the power supply were switched to 240 V

Quote:
Originally Posted by trialanderror View Post
the grounded (?) 3 outlet splitter is only rated for 15AMP's and would be taking a 45 AMP load so I may need to find a better splitter
Three 1400 W devices on 240 V would draw 17.5 A max.
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Old 11-14-2017, 05:09 AM   #4
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


I have built custom extension cords - always remember that the devil is in the details!!

http://www.cmewire.com/catalog/sec19...-cu-01-amp.pdf

shop for your wire carefully ...
https://www.homedepot.com/b/Electric...vZbm7vZ1z0zudd

make sure EVERY component can handle the amperage

using a Dryer plug for suitable current ratings works

are there code problems building a box at the end of your custom cord which holds suitable outlets? rather than using an off-the-shelf splitter? electrically you can build a box fed by the cord which holds 3 suitable outlets, I'm just not sure what the code issues might be. I have a specific inspector I call here with that sort of question.
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Old 11-14-2017, 08:18 AM   #5
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


Regular receptacles are limited to 20 amps maximum . You cannot feed them from a 50 amp circuit.
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 11-14-2017, 10:09 AM   #6
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


Thank you everyone. Looks like it may make more sense to hire an electrician to just to rewire it for 110V at the panel. The computers will be closer to the panel anyways
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Old 11-14-2017, 12:27 PM   #7
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


I think hiring this done would be good for two reasons:
1. Extension cords are not meant for permanent use
2. Nominal voltage in the US has been 120 volts and not 110 for a long enough time that anyone who says/writes 110 leads me to believe they have little experience with electrical work
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Old 11-14-2017, 03:30 PM   #8
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


I came to this thread after the OP wisely realized that a professional was in order. If there were extra reward points for the most dangerous idea of the year, this might have been the winner.
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Old 11-14-2017, 08:36 PM   #9
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


maybe the darwin award of the year?
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Old 11-15-2017, 12:56 AM   #10
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


Surely http://www.diychatroom.com/f18/fun-project-help-563658/ must be in the running!
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Old 11-15-2017, 02:06 AM   #11
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Re: Using 3 x 110V 15A extension cords for 250V 50A outlet


(red face)

looks like I mis-read the original post. This sounds like sub-panel time.
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