(b) In addition to recommendations for minimum wages, the wage board may recommend such regulations as it deems appropriate to carry out the purposes of this article and to safeguard minimum wages. Such recommended regulations may include regulations defining the exclusions from the term "employee" set forth in subdivision five of section six hundred fifty-one. Such recommended regulations may also include, but are not limited to, regulations governing piece rates, incentives, and commissions in relation to time rates; overtime or part-time rates; waiting time and call-in pay rates; wage rate provisions governing split shift, excessive spread of hours and weekly guarantees; and allowances for gratuities and, when furnished by the employer to his employees, for meals, lodging, apparel and other such items, services and facilities.

(c) The wage board may also recommend, to the extent necessary in order to prevent curtailment of opportunities for employment, regulations for (1) the employment of learners and apprentices, under special certificates issued by the commissioner, at such wages lower than the minimum wage established by this article and subject to such limitations as to time, number, proportion and length of service as shall be prescribed in such regulation, (2) the employment of individuals whose earning capacity is affected or impaired by youth or age or by physical or mental deficiency or injury, under special certificates issued by the commissioner, at such wages lower than the minimum wage established by this article and for such period as shall be prescribed in such regulation, (3) the establishment of a period not extending beyond seventeen consecutive weeks during which a resort hotel or camp may employ students under special certificates issued by the commissioner, at such wages lower than the minimum wage established by this article as shall be prescribed in such regulation, and (4) the employment of residential employees in a non-profit making religious, charitable or educational organization or in a non-profit making college or university sorority or fraternity under special certificates issued by the commissioner at such weekly wage as shall be prescribed in such regulation.