How to use the non-contact Electric Sensor Test Pencil to test the lamp to detect the open-phase operation of the low-voltage three-phase motor power supply
When the motor runs out of phase, the inspection lamp is checked phase by phase. Turn on the power contactor, or the upper and lower sides of the fuse. The test light does not light up across the touch light, and the phase of the power supply under test is normal.
The filament glows red and dim light, and the contact singeing fuse is broken.
