Omit 25, 26 and 27.
28. Same as for direct current.
29. There must be an insulation between the starter or primary windings and the frame of not less than one megohm.
30, 31, 32, 32a. Same as for direct current.
33. Rheostat. Furnish and install an approved hand-starting rheostat for inserting resistance in rotor circuit in starting, of proper size to insure the starting of motor in not exceeding 15 seconds without overheating.
33a. Same as for direct current, except that switch must be either three- or four-pole, according to current available.
Omit 36d with alternating current machine.
CLASS 3
Large Installation with Unusually Long Pipe Lines.
1. Same as for Class 1.
2. Exhauster shall be of the reciprocating piston type.