Generator, modulator and control lamps with power dissipated by the anode, over 25 watts. Methods for monitoring the absence of intra-tube short circuits and breaks of electrodes and heater
Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 6. Residual current devices in TT and TN systems
€10
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