How to use the Smart Non-Contact Tester Pen to check the lamp to monitor the blown fault of the resistance wire of the enclosed three-phase electric heater
The three-phase electric heater is closed, and the resistance wire is burnt out for monitoring. The neutral point of the star connection method, and the ground wire is used to check the lamp directly. The three-phase resistance wire is normal, and the inspection light is not bright at all.
The filament glowed red and dimly bright, and the first-phase resistance wire was blown. The brightness o
