In this paper, local and nonlocal symmetry classifications are considered for four equivalent
nonlinear telegraph equations. A complete potential symmetry classification of a scalar
nonlinear telegraph equation is given through the point symmetry classification of a related
potential system. Six new classes of equations are shown to admit potential symmetries. The
relationships between local (including contact) and nonlocal (potential) symmetries of these
equations are explored. A physical example is considered for possible applications of the …