Transfer notice - Can I refuse to go at different location on certain grounds?

There is a clause in appointment letter regarding transfer which is "Your initial place of work will be in Delhi. However, your service are transferable, and you may be assigned after reasonable notice, to any location in India or abroad where the company or any one of its associates or customers conducts businesses. While on transfer you will be governed by the rules, regulations and conditions of service of that location.
1. What is the meaning of reasonable notice?
2. Will I get any document to sign before transfer to a different location? If 'Yes' then please provide format of the document.
3. Can I refuse to go at different location on certain grounds I.e. Medical?

Hi Nimmy,
It is a general clause to have transfer option.
Reasonable notice can be one month or a stipulated/agreed timeline.
Transfer orders can be issue at the time of such deputation to another place.
Format for the deputation/transfer will be provided by your company.
There would be on employer who would force you to work if you have medical issues.
But you have not mentioned your company's nature, is it a Factory or Software company or other service sector?

Management is trying to transfer me without transfer letter/notice as mentioned in employment letter. Is this a valid transfer?

In that case you can resist with your objections. Why don't you speak to them in the first place, then resist.
If your company does not have any transfer order they have to develop. How would they communicate with the deputed branch/office is a question?
You should have a proof for your representation at the new place also, so insist on it.

Where should the employee send the legal notice? Is it working location or registered office of the company?