(1) Depth of Working Space. The depth of the working space in the direction of live parts shall not be less than that specified in Table
1.10.2.1(a)(1) unless the requirements of 1.10.2.1(a)(1)a, (a)(1)b, or
(a)(1)c are met. Distances shall be measured from the exposed live
parts or from the enclosure or opening if the live parts are enclosed.