I don't know that there are any regulations specific to travel nurses.
Here's an IRS article on out of town travel:
http://www.irs.gov/taxtopics/tc511.html
and some tax home articles, specific to traveling nurses. https://www.americantraveler.com/state-tax-questions
and http://www.thegypsynurse.com/tax-home/
https://ttlc.intuit.com/community/state-taxes/discussion/re-how-to-file-exempt-from-state-income-tax...
