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This paper presents results of a spectroscopic analysis of theX-CLASS-redMaPPer (XC1-RM) galaxy cluster sample. X-CLASS is a serendipitoussearch for clusters in the X-ray wavebands based on the XMM-Newton archive,whereas redMaPPer is an optical cluster catalogue derived from the SloanDigital Sky Survey (SDSS). The present sample comprises 92 X-ray extendedsources identified in optical images within 1\arcmin~separation. The areacovered by the cluster sample is $\sim$ 27 deg$^{2}$. The clusters span a wideredshift range (0.05 < z < 0.6) and 88 clusters benefit from spectrosopicallyconfirmed redshifts using data from SDSS Data Release 14. We present anautomated pipeline to derive the X-ray properties of the clusters in threedistinct apertures: R\textsubscript{500} (at fixed mass overdensity),R\textsubscript{fit} (at fixed signal-to-noise ratio), R\textsubscript{300kpc}(fixed physical radius). The sample extends over wide temperature andluminosity ranges: from 1 to 10 keV and from 6$\times$10$^{42}$ to11$\times$10$^{44}$ erg\,s$^{-1}$, respectively. We investigate theluminosity-temperature (L-T) relation of the XC1-RM sample and find a slopeequals to 3.03 $\pm$ 0.26. It is steeper than predicted by self-similarassumptions, in agreement with independent studies. A simplified approach isdeveloped to estimate the amount and impact of selection biases which might beaffecting our recovered L-T parameters. The result of this simulation processsuggests that the measured L-T relation is biased to a steeper slope and highernormalization.

X-ray properties of X-CLASS-redMaPPer galaxy cluster sample: The luminosity-temperature relation