The various types and classes of connectors are intended for use as follows:

Class C connectors are intended for external interconnection use on vans, shelters, trailers, buildings and heavy duty (rough service) applications. They are not for primary power distribution.

Class J connectors are intended for use only where class C connectors can be used but where a wire support grommet is necessary.

Class L connectors are intended for power connections in the current range from 40 to 200 amperes where heavy duty, waterproof and arc quenching ability are required and are to be used only with heavy-duty jacketed cables specified on the applicable insert standard.

Class R connectors are intended for use as general purpose heavy-duty connectors where pressurization and arc quenching ability are not required. The connectors can be made weatherproof when the accessory sealing adapter is attached. They are not for primary power distribution.