CCD spectrophotometry of CVs. IV. 3430-7850 Angstrom atlas for 27 faint systems

CCD fluxed spectra are presented for 27 objects from the \cite[Downes & Shara (1993)]{ref3} catalogue of Cataclysmic Variables (CVs). The stars have been selected among those listed as lacking published spectra. As for previous papers in this series, the aim is to check the CV status of the objects and to provide spectrophotometric data over a wide wavelength range. Integrated BVR_C magnitudes, continuum fluxes at selected wavelengths and integrated fluxes of emission lines are derived for the programme stars. Among the 27 programme stars, 18 show a spectrum supporting the CV classification.