Dear Mr. Kaushik,
As you said that for national holiday if our industry is in continuous process then we have to pay three times wages.I faced this issue in a cement industry that comes under continuous process but as per UP Establishment National Holidays Act, 1961 says that if we will take work then we have pay twice the wages for a day or at the option of the employee wages for that day and also a substituted holiday with wages falling within the next calendar month not being a weekly holiday.
I hope that now you will be clear on this issue.
Good day
L.K.Gupta