Repairs, adjustments and checks are carried out in the laboratory for: maximum current relays, minimum current relays, maximum voltage relays, minimum voltage relays, thermal relays, power relays, JT and IT automatic circuit breakers, reverse power, signaling relays, time relays, trip coils of low-voltage switches with high breaking capacity, power transformers, current-measuring transformers, voltage-measuring transformers, low-voltage cables, busbars, insulators, automation circuits and remote controls, direct and alternating current electric generators; any power, voltage < 1 k, direct current and alternating current electric motors with voltages < 1 kV, reactor coils, earth plugs, measuring the dielectric strength of the oil.