2. (1) The [1954 c. 33 (N.I.).] Interpretation Act (Northern Ireland) 1954 shall apply to Article 1 and the following provisions of this Order as it applies to a Measure of the Northern Ireland Assembly.
(2) In this Order—
“the Department” means the Department of Economic Development;
“the Executive” means the Health and Safety Executive for Northern Ireland;
“the principal Order” means the [1978 NI 9.] Health and Safety at Work (Northern Ireland) Order 1978.