Kiln Academy kiln-education

The Confusion about 120v Outlets

Image result for 120v 15 vs. 20amo"About once a week, someone tells us, 'The 120 volt plug on my new kiln doesn't match my wall outlet.' This is one of the most common 120v outlet questions we hear. Many people do not know the difference between 15 amp and 20 amp 120 volt wall outlets, because they look almost the same.But a 20 amp, 120 volt kiln cannot be plugged into a 15 amp, 120 volt wall outlet. Understanding your outlet type is one of the first steps when installing your kiln at home.

The common 15 amp, 120 volt household outlet (also called a receptacle) is used throughout North America. Lamps, vacuum cleaners, refrigerators, etc. plug into it. The outlet has two vertical slots; the U-shaped hole is for the green safety grounding wire.

The 20 amp, 120 volt outlet looks like the 15 amp outlet, except one of the vertical slots is shaped like a sideways T. 
NEMA, the National Electrical Manufacturers Association, has standardized these designs and designated them NEMA 5-15R and 5-20R. (The number after the hyphen indicates amperage.) Standardized plugs and outlets are so ubiquitous that we rarely think about them. But they helped to bring electricity into millions of homes and factories.

If you have a standard 15-amp 120v outlet, the Paragon Caldera Digital is a great option. It draws 14 amps and fires up to Cone 10 (2350 F). If you have a 20-amp 120 volt outlet, the Evenheat Kiln HF 810 is an excellent choice but only fires to Cone 8 (2300 F).

Since these kilns differ in amperage and firing capacity, their electricity usage also varies. You can calculate the cost of firing your kiln to estimate what each firing will cost based on your local rates.

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