(1) The Commissioner may by executive instrument declare any place to be a prison.

(2) The Commissioner may by executive instrument appropriate particular prisons to particular classes of prisoner, and any prisoner of the appropriate class shall be confined in that prison.

(3) A warrant, summons or other legal instrument addressed to the officer in charge of a prison or any other person and identifying that prison by any sufficient description shall not be invalidated by reason only that the prison is usually known by a different description.