FREE Download-The importance of using the correct wiring and voltage for kiln outlets. This question-and-answer column covers the difference between 220 and 240 volts, the preference for copper wiring over aluminum, and the importance of having a circuit with a safety grounding wire for use with kilns. This article was originally published on page 67 in the Fall 2011 issue of Glass Patterns Quarterly. By Arnold Howard Photography by Chance Agrella