We provide the catalogue of X-ray detected galaxy clusters spectroscopically confirmed using DR14 SPIDERS spectroscopic data. Galaxy clusters were identified through the emission of their hot baryonic component as X-ray extended sources in ROSAT and XMM-Newton observations. The optical counterparts were found by optimally searching photometric data for the existence of a red-sequence formed by their member galaxies. Spectroscopic redshifts obtained by SPIDERS (DR14) provide confirmation of the clustered nature of these objects and their redshift (up to z~0.6). We assigned cluster membership combining an algorithm and multiple independent visual validations of individual objects. The gas properties derived from X-ray observations (luminosity, R500, etc.) are derived using precise cluster redshifts and they provide an estimate of their total mass (median M200c ~ 5.1014 Msun). We provide estimates of the velocity dispersion in galaxy clusters using methods adapted to the low number of spectroscopic members per system. This VAC is available as catCluster-SPIDERS_RASS_CLUS-v2.0.fits and contains the sample of galaxy clusters confirmed with DR14 spectroscopic data (2500 deg2) down to richnesses λOPT=30. In DR13, a related VAC was released containing the pilot sample of galaxy clusters confirmed in the 300 deg2 area of DR13 spectroscopy data, down to the lowest richnesses, For more details on this VAC, click here.