Non resident gone outside india for employment

Hello friends..

1) i wanted to know, when indian citizen goes outside india for the purpose of 'employment",whether he  become NON RESIDENT by staying outside india for more than 182 days(during the year in which he gone outside india) or he has to compulsorily fullfill the additional conditions to become non resident? 

2)if he goes outside india for the purpose of employment,whether  exception to the basic condition will apply or normally Basic conditions and additional conditions will apply to know his residential status?

PLEASE REPLY..