What is Low Voltage (LV) switchgear? What is Medium Voltage (MV) switchgear? What is High Voltage (HV) switchgear? Where LV/MV applications are used? CHINT MV/LV switchgear. Conclusion. What is switchgear? A power surge is well known for wreaking havoc on your electrical infrastructure.Local Union #357 Training Facility. Address: 620 Leigon Way Las Vegas Nevada 89110 map. Phone: (702) 459-7949. Email: