N.H. Rev. Stat. Ann. § 604-B:6

The allocation of cases between the public defender program and assigned counsel shall be in accordance with a plan adopted by the public defender program and approved by the judicial council. The plan shall establish caseload limits for defender attorneys in accordance with professional standards under the code of professional responsibility and shall provide for appointment of assigned counsel only where maximum caseloads have been reached or public defender attorneys are otherwise unavailable.