Lead Wire Gauge Used in UL-Certified VCBs (UVL/UVM/UVH Series)

Lead Wire Gauge Used in UL-Certified VCBs (UVL/UVM/UVH Series)

This article explains the lead wire gauge used in LS Electric’s UL-certified Vacuum Circuit Breakers (VCBs), specifically for the UVL, UVM, and UVH series.


Applicable Products:

  • UL VCB Series: UVL / UVM / UVH

Wire Specification:

  • Wire Gauge: AWG 14

  • Wire Type: UL Certified XHHW

Technical Background:

  • According to UL standards, the required wire gauge varies depending on the current rating.

  • However, for auxiliary control circuits such as shunt trip, closing coil, and CT (current transformer) wiring, the minimum required wire gauge is AWG 14.

  • Additionally, UL-certified wire cannot be smaller than AWG 14, which is why all lead wires used in LS Electric’s UL VCBs comply with this standard.

Additional Information:

  • The attached wiring diagram shows an example for the UVM fixed type, where all lead wires—including the secondary connector inside the compartment—also follow the same AWG 14 / XHHW standard.

Attachment:

  • Wiring Diagram: UVM Fixed Type VCB (PDF)