| Hot filling |
 |
| To avoid humidity being absorbed by the hygroscopic insulation
material the components are dried thoroughly and filled at an
elevated temperature. |
| |
| Swaging & Rolling |
 |
| Swaging is the optimum forming method for certain types of our
mineral insulated cables, naturally special equipment must be
employed. The inner conductors are best protected when processed
on a continuous calibre mill. However, the tolerances generally
required for the sheath wall limit the use of this method to a few
special designs. |
| |
| Annealing |
 |
| The production of a flawless mineral insulated cable right down to the
smallest dimensions requires a considerable number of intermediate
annealing processes. |
| |
| Pickling |
 |
| Pickling removes all discolouration which occurs in spite of the
protective gas used during the annealing process. |
| |
| Drawing |
 |
| Pickling removes all discolouration which occurs in spite of the
protective gas used during the annealing process. |
| |
| Final Annealing |
 |
| Final annealing is conducted under protective gas in a continuous
process to attain a smooth, bright surface. |
| |
| Final Product |
 |
| Each drawn batch undergoes quality assurance tests - as cable coils
of long length - before dispatch. |
