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-   -   Converting 3 prong to 4 prong on electric kiln (http://www.diychatroom.com/f18/converting-3-prong-4-prong-electric-kiln-105324/)

ranger47 05-23-2011 01:04 PM

Converting 3 prong to 4 prong on electric kiln
 
I have a 240 volt 50 amp electric kiln with a 3 prong plug. I have a 4 prong outlet for a dryer I would like to use. The kiln has 2 hots and the ground hooked up. Can I hook the new 4 prong cord up and just leave the neutral disconnected? Of course I don't want to burn down the house and wanted an expert opinion


Thanks!

jbfan 05-23-2011 01:16 PM

The rating on the dryer receptacle is 30 amps, and the kiln is rated for 50.
You can not use the dryer receptacle.

ranger47 05-23-2011 01:22 PM

I am a little confused about that because on one place on the kiln it says 50 amps and another place it says 25 amps

powerfactor 05-23-2011 01:28 PM

Quote:

Originally Posted by ranger47 (Post 653241)
I am a little confused about that because on one place on the kiln it says 50 amps and another place it says 25 amps

sorry but that is electrical hieroglyphics' for man the lifeboats we are way over our heads here. :laughing:

mpoulton 05-23-2011 04:27 PM

Quote:

Originally Posted by ranger47 (Post 653241)
I am a little confused about that because on one place on the kiln it says 50 amps and another place it says 25 amps

Well you better figure that out for sure! Look on the rating plate of the kiln where it lists voltage, current, and probably wattage.

ranger47 05-23-2011 05:24 PM

See below. At the top it says 25 amps, but down below it says 50 amps. Its a cress model 328J kiln but I couldn't find much online.

https://lh6.googleusercontent.com/_9...s576/photo.JPG

NJMarine 05-23-2011 06:02 PM

If you go to the cress website you will see that it a 50 amp outlet

ranger47 05-23-2011 06:13 PM

So I emailed Cress and they said, "Go with the top decal, 25 amps." Also the real model number is B23H which is closest to this one

NJMarine 05-23-2011 07:10 PM

go with the mfg says

ranger47 05-23-2011 07:24 PM

So back to my question. The kiln has 2 hots and the ground hooked up. Can I hook the new 4 prong cord up and just leave the neutral disconnected?


Thanks!

Techy 05-23-2011 08:40 PM

Yes




make sure you tape the end, though

mpoulton 05-23-2011 09:03 PM

Quote:

Originally Posted by ranger47 (Post 653452)
See below. At the top it says 25 amps, but down below it says 50 amps. Its a cress model 328J kiln but I couldn't find much online.

It requires 25A. The lower label is on the Kiln Sitter, which is a completely separate device made by a separate company and installed as part of the kiln. The Kiln Sitter is a timer and automatic shutoff (using pyrometric bars) for the kiln, and the 50A rating is it's maximum allowable load. The upper nameplate is for the kiln itself, and says 25A.

Use a 4-wire cord and leave the neutral (white) disconnected.

ranger47 05-23-2011 09:31 PM

The hots on the old cord are both white. Does it matter which one goes where (red and black)? I will connect green (ground) and leave white disconnected.

mpoulton 05-23-2011 11:00 PM

The hots are interchangeable. Just make sure the ground goes to the frame.


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