An individual is not entitled to any benefits for any week with respect to which the secretary finds that the individual's total or partial unemployment is due to a labor dispute at the factory, establishment, or other premises at which the individual is or was last employed. However, this section does not apply if it is shown to the satisfaction of the department that:
If in any case separate branches of work which are commonly conducted as separate businesses in separate premises are conducted in separate departments of the same premises, each department shall, for the purpose of this section, be considered a separate factory, establishment, or other premises.
SDCL 61-6-15