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Old 05-01-2011, 09:39 AM   #1
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220v Plug end differences


Here's the deal.
I want to use a generator for a electric 220v garage heater. Not sure if the plug end is the same as the receptical on the generator. Based on what I've been seeing is that there are different plug ends. Why is that? And will these two work together. Thanks.

Here's the generator and heater links:


http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT


http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

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Old 05-01-2011, 10:17 AM   #2
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220v Plug end differences


The genarator has a 120/240 volt receptacle, and the heater is a straight 208/240 plug.

The plug and receptale will not work together.

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Old 05-01-2011, 10:22 AM   #3
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220v Plug end differences


receptacles and plugs are rated for both voltage and current (amps). Each different design is that way so you cannot plug an incorrect plug into a give receptacle.


Many generators use a 30 amp 120/240 receptacle. That has 4 conductors and supplies both 120 volt and 240 volts supplies up to 30 amps. There are also receptacles that are designed to supply just 240 voltage. Those would have only 3 conductors.

then to further make things more fun, there are straight blade receptacles and twist lock receptacles. The twist lock use a slight twisting motion to lock the plug into the receptacle so it is not accidentally removed.

you can go to this site and see a chart of some of the various receptacle designs. There are a lot more but I think this one likely included what you are looking at there.

http://www.nooutage.com/nema_configurations.htm
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Old 05-01-2011, 12:27 PM   #4
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220v Plug end differences


Thanks for that info. So do you think I can find a gererator that will accept that plug style? That's all I really need to worry about, right? Is that plug fitting into the correct receptical. Thanks.
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Old 05-01-2011, 04:11 PM   #5
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220v Plug end differences


Just make an adapter with a short length of cable, or replace the plug on the heater so it matches the generator.
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Old 05-01-2011, 05:03 PM   #6
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220v Plug end differences


Quote:
Originally Posted by jbfan View Post
The genarator has a 120/240 volt receptacle, and the heater is a straight 208/240 plug.

The plug and receptale will not work together.



" Just make an adapter with a short length of cable, or replace the plug on the heater so it matches the generator".

Will this work?
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Old 05-01-2011, 05:22 PM   #7
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220v Plug end differences


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Originally Posted by gmbwrenchn View Post
" Just make an adapter with a short length of cable, or replace the plug on the heater so it matches the generator".

Will this work?
Yes. That's why I suggested it.
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Old 05-01-2011, 05:27 PM   #8
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220v Plug end differences


Actually, you have a problem. That generator isn't big enough for that heater. It's not a 4500W generator, it's only 3500 (read the fine print) and that heater requires 4kW at 240V. You'll need a bit bigger generator. It's usually a good idea to have at least 25% extra generator capacity beyond the load you're using, otherwise it may not last very long. You might try a 5kW generator - but make sure it's really 5kW continuous, not 5kW peak with a lower continuous rating.

You'll still have to make an adapter cable or replace the plug on the heater.
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Old 05-01-2011, 05:32 PM   #9
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220v Plug end differences


Ok............thank you very much for that info! That will do it, thanks.
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Old 05-01-2011, 07:30 PM   #10
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220v Plug end differences


This one should work right? Just change the plug to fit the receptical, Thanks.

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT
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Old 05-01-2011, 11:40 PM   #11
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220v Plug end differences


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Originally Posted by gmbwrenchn View Post
This one should work right? Just change the plug to fit the receptical, Thanks.

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT
Yes, that should do it. Just get an L14-30P for the heater and you're good to go. The neutral connection will be unused.
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Old 05-02-2011, 09:11 PM   #12
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220v Plug end differences


Ok thanks. So after I snip the end of the heater plug off ( which I don't have yet ) there will be three wires: White, Black, & Red? White not being used? Thanks.
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Old 05-02-2011, 09:24 PM   #13
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220v Plug end differences


Quote:
Originally Posted by gmbwrenchn View Post
Ok thanks. So after I snip the end of the heater plug off ( which I don't have yet ) there will be three wires: White, Black, & Red? White not being used? Thanks.
no. on the heater there will be only 3 wires: they could be just about any color but one should be green. That will go to the ground terminal in the plug usually a green screw). The other 2 wires will go to the hot wire terminals (usually brass colored screws) There will be nothing on the neutral connection (usually a silver colored screw)

what mpoulton was meaning to say is you will not connect anything to the neutral connection of the plug. The neutral wire would be a white wire. In your situation, you aren't going to actually have any white wires to use as a neutral although one of the wires in your cord on the heater might be white, it still isn't a neutral wire if your heater is a straight 240 volt appliance.
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Old 05-02-2011, 09:25 PM   #14
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220v Plug end differences


Whoa...don't forget the part that the generator won't handle that load....no matter what plug confuguration you come up with. Forget the adapter, it's not going to work.
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Old 05-02-2011, 09:41 PM   #15
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220v Plug end differences


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Originally Posted by Missouri Bound View Post
Whoa...don't forget the part that the generator won't handle that load....no matter what plug confuguration you come up with. Forget the adapter, it's not going to work.

Oh, but the second genset will.

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