Line bushing and terminal studs with increased ignition gaps

A dynamo-electric machine for explosive environments, comprising:

• a housing having a threaded recess;
• and
• a line bushing made from an electrically conductive material and having a threaded portion and a stop shoulder and opposite ends, each of the opposite ends having a connection option for a line or braid,
• a threaded bush configured as an insulator and having a shoulder and an external thread with a first thread length for threaded engagement with the threaded recess of the housing, said shoulder and external thread defining a first ignition gap when the threaded bush is screwed into the threaded recess of the housing, and
• an internal thread with a second thread length for threaded engagement with the threaded portion of a terminal stud, with the second thread length being greater than the first thread length, said stop shoulder in conjunction with the second thread length defining a second ignition gap when the terminal stud is screwed into the threaded bush.