(1) A strike or a lock-out shall be illegal if—
(i) it is commenced or declared in contravention of section 22 or section 23; or
(ii) it is continued in contravention of an order made under sub-section (3) of section 10 1[or sub-section (4A) of section 10A].
(2) Where a strike or lock-out in pursuance of an industrial dispute has already commenced and is in existence at the time of the reference of the dispute to a Board, 4[an arbitrator, a] 2[Labour Court, Tribunal or National Tribunal], the continuance of such strike or lock-out shall not be deemed to be illegal, provided that such strike or lock-out was not at its commencement in contravention of the provisions of this Act or the continuance thereof was not prohibited under sub-section (3) of section 10 4[or sub-section (4A) of section 10A].
(3) A lock-out declared in consequence of an illegal strike or a strike declared in consequence of an illegal lock-out shall not be deemed to be illegal.