Yes, Mr. Mark, the grooves protect the elements from unintentionally touching but mainly support the element coils from creeping.
The problem with elements grooved into bricks is that in pockets behind the coils the temperature may be significantly larger than the temperature in the kiln. This shortens the life expectancy of the element at higher temperatures.
Jan
The problem with elements grooved into bricks is that in pockets behind the coils the temperature may be significantly larger than the temperature in the kiln. This shortens the life expectancy of the element at higher temperatures.
Jan