Determination of electric capacity for box type furnace:
Allowing for heat loss through furnace walls, the electric capacity can be approximated from the following formula and diagram.
Temperature raising time and thermal capacity of processed material are not included in this formula.
Series and parallel connections are generally used with EREMA elements. The maximum number of EREMA elements in series must limited to 2, or two-step serial connection must be used. If furnace chamber temperature exceeds 1350°C parallel connection must be used. Open delta connection (single-phase 3 circuits / 6 wire delta) is recommended for three-phase connection.
- Single-phase parallel connection(Figure11)
- Single-phase two series and parallel connections(Figure12)
- Open delta connection(Figure13)