It's where the ridges are on the point of the connector that causes it to be more flexible and it won't damage connector
Without reading the first response, I'll give it a shot; Strain relief connectors are fittings that physically apply circular pressure to the outer insulation of power cords for support; usually vertically installed non metallic cords. In other words; They supply physical support where a non metallic cord is vertically dropped from a electrical junction box. You may see them in a facility where utilities are required from above with no walls or underground raceway are present. There are typically two types of strain relief: a compression fitting/ connector where the fitting tightens on the cord at the point of connection, and one called," chinese- fingers. Where a web of interlocking metal tightens farther down the cable from the fitting, and spreads the physical tightness over a larger area on the drop cord. And, they tighten as additional tension is, or may be applied. Sorry if I am rambling some...I'm sure there are other applications, but as for electrical work, I hope this helps
Holds a a cord together at a connection.
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