Use Copper Wire for Hook Up
- Do not use aluminum wire for the final connection to the kiln.
- Kilns generate constant heat for extended periods, which causes wiring near the kiln to get hotter than in other appliances.
- Aluminum wire oxidizes quickly when heated, and aluminum oxide increases resistance, leading to dangerous overheating at the terminal connection.
- Overheated connections can cause a fire. Copper, by contrast, resists oxidation and maintains better conductivity.
- Local codes may allow aluminum wire to a sub-panel, but it must stay within its temperature rating even when the kiln runs at full power for long periods.
- Aluminum wiring was once common in homes but was phased out due to its tendency to expand under load, loosening connections and increasing fire risk.
- For safety, always use copper wiring in kiln circuits.
April 1, 2025
