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Electrical Wire and Cable

How Bad Advice Can Burn Your House Down

By Dave Rongey - Summary:

How to Wire an Electric Kiln and How NOT to Wire an Electric Kiln.

A Classic Example of Bad Advice

Question: I have a kiln with a 6-50plug. The kiln is: Operating Voltage: 240V (208V and 3 phase available)
Amperage: 40A Watts: 9600W

I read on a website that I could build an extension to connect it to my Dryer outlet which has a 10-30r. The Dryer breaker is 50A. I know that 50A to 30A extensions are available at RV and Welding resources, but are expensive and have slightly different plugs or receptacles than what I need, so I am making my own.

I have a 6-50r, connected to 25? of 10/3 wire(black, white and green) at one end and a 10-30p at the other. The black and white wires are attached to the side blades on both ends and the green to the center ones.

The Dryer wall outlet has black, red and white wiring. When I plugged it in(not yet attached to kiln) it not only tripped the Dryer breaker, but the main breaker also. I took apart both ends and saw that the white and black wires on the 10-30p were attached opposite from the Dryer outlet. I switched them and plugged it in again. It tripped the Dryer breaker but not the main. Again nothing is connected to the kiln. It blows the breaker as soon as plugged in to dryer outlet.

What am I doing wrong?

Also on the 6-50r the wires are held directly in place with 2 large copper screws and one silver one, with no plate in between the screws and wire.. Is this correct?

Thank you.


This electrical question came from: Bobby, from Scottsdale, Arizona

Additional Comments: Thank you

Dave’s Reply:
Thanks for your electrical question Bobby

Incorrect and Hazardous Kiln Wiring

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RV 50 Amp Cord Adapters
The RV cord adapters that you have described are designed to safely provide 30 amps of power from a 50 amp circuit, NOT 50 amps of power from a 30 amp circuit – there is a BIG difference because the 30 amp circuit cannot provide 20 extra amps of power, and if it is attempted it will create a hazardous condition.

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