[en] The conductivity of metal single-wall carbon nanotube bundles was investigated in the temperature range 4.2-330 K and electric fields up to 50 V. Short electrical pulses of 10 ns duration, allowed us to exclude the effect of heating on the current-voltage characteristics. The temperature dependence of conductivity is shown to be given by the power function G is proportional to T 0.45. At helium temperatures the asymptotic dependence of current on voltage is close to J proportional to V 1+ α at α= 0.45. Comparison between the measured and the calculated data demonstrates that our results is well described in the framework of the Luttinger liquid conductivity. The self-heating of the carbon nanotube bundles was observed in the DC regime of measurements. A method for determine a temperature of the self-heating of nanotube bundles as a function of applied electric field was proposed. Above some threshold value of voltage a power low dependence of self-heating temperature on voltage T proportional to V p was observed with the exponent p= 2.1 in the range 4.2-200 K and p= 1.35 above 200 K.