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We review in a systematic way how anomaly free $SU(3)_c\otimes SU(3)_L\otimesU(1)_x$ models without exotic electric charges can be constructed, using asbasis closed sets of fermions which includes each one the particles andantiparticles of all the electrically charged fields. Our analysis reproducenot only the known models in the literature, but also shows the existence ofseveral more independent models for one and three families not considered sofar. A phenomenological analysis of the new models is done, where the lowestlimits at a 95\% CL on the gauge boson masses are presented.

Systematic study of the $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ local gauge symmetry