The board of commissioners of every municipality governed by the commission form of government in counties of the first class or second class, in assigning the powers and duties to be performed by each department pursuant to section 40:72-5 of the Revised Statutes, shall assign to each department the powers and duties having the greatest relevancy to the subject matter as designated in the name of each respective department and as will result, as nearly as possible, in an equal distribution of powers and duties to each department.
N.J.S. § 40:72-6.1