- You must replace the elements.
Example: JD2927 elements rated for 208V (10.4 ohms) will draw 23 amps at 240V—too much for circuits rated at 20 amps. - Controllers (DynaTrol, Genesis) work fine at either voltage.
- Check electrical specs for your kiln as a 240V model:
Make sure your breaker and wiring can handle the higher amperage.
Breaker size = kiln’s amp rating × 1.25, rounded up to the next standard size.
Choose wire size based on the new breaker size.
| 20 amps | 12 gauge copper |
| 30 amps | 10 gauge copper |
| 40 amps | 8 gauge copper |
| 50 amps | 6 gauge copper |
| 60 amps | 6 gauge copper |
| 70 amps | 4 gauge copper |
| 80 amps | 3 gauge copper |
| 90 amps | 2 gauge copper |
| 100 amps | 1 gauge copper |
| 125 amps | 1/0 gauge copper (pronounced "one aught") |
| 150 amps | 2/0 gauge copper (pronounced "two aught") |
| 175 amps | 4/0 gauge copper (pronounced "three aught") |
| 200 amps | 250 MCM copper wire (MCM = Thousand Circular Mils) |
| 225 amps | 350 MCM copper wire |
