The CL (R&A) Act, 1970 is applicable to:-
(a) to every establishment in which twenty or more workmen are employed or
were employed on any day of the preceding twelve months as contract labour
(b) to every contractor who employees or who employed on any day of the preceding twelve months twenty or more workmen:
If you have not deploy 20 or more employees than you need not to take any Registration. However, pls be note if you deploy 20 or more personnel through various contractor's role than you have to obtain RC under the Act and you have to furnish detail in r/o all the contractors. But the contractor will cover only when he himself deploy 20 or more at your premises.
Hope my point is cleared, Umakanth sir can put more light on this.
18th January 2017 From India, Delhi