N.H. Rev. Stat. Ann. § 277:11

Whenever the nature or condition of any such place of employment, or the machinery or other appliances therein, are such as to render work therein or in proximity thereto dangerous to the safety or health of employees, it shall be the duty of the employer to provide and maintain such safeguards, safety devices, appliances and lighting facilities, and to do such other things as may be reasonably necessary and practicable to lessen the dangers of such employment.