If you are employed in a company in another EU/EEA country, and are going to carry out an assignment for this company in Norway, you have the right to work without a residence permit.
If you are to stay in Norway for more than three months, you must apply for a residence card. This is free of charge. You must apply no later than three months after your arrival in Norway.
If you meet the requirements below, you can move to Norway and start working immediately. You must carry documentation that you meet all the requirements bellow through your stay in Norway, even if you are staying for more or less than 3 months.