VFD CABLE

Standard wire like THHN or generic tray cable is not designed to handle pulse-width modulation (PWM) from Variable Frequency Drives. VFDs generate rapid high-voltage spikes (reflected waves) up to 1,800V and high-frequency noise (EMI). Standard PVC/THHN insulation breaks down under this stress, causing hotspots, pinhole leaks, and premature failure. VFD cable uses heavy-duty XLPE thermoset insulation and dual shielding (foil + tinned copper braid) to withstand these spikes and prevent signal interference with nearby control lines.

Symmetrical VFD cables feature three split ground wires placed evenly in the geometry between the phase conductors. This symmetrical alignment balances the magnetic field, reduces induced ground currents, and safely drains common-mode voltage back to the drive. This prevents destructive voltage from seeking a path through your motor bearings (preventing "fluting" and bearing failure) and extends overall motor lifespan.

Yes. Our VFD cable is UL Listed as Type TC-ER (Exposed Run). Under the National Electrical Code (NEC), TC-ER rating permits the cable to be routed exposed right out of the cable tray directly into motor terminals and machinery without requiring rigid metal conduit, drastically cutting down installation labor and material costs.

To achieve optimal EMI containment and noise suppression, manufacturers generally recommend terminating VFD cable with 360-degree grounding cable glands (EMC glands) at both the drive cabinet and motor junction box. While twisting the shielding braid into a traditional "pigtail" is a common shortcut, it can create an antenna effect that broadcasts high-frequency noise. Using proper EMC termination fittings helps maintain full 360-degree shield continuity back to earth ground. Always consult the VFD drive manufacturer’s installation manual and your local electrical inspector for specific enclosure termination requirements.

Yes! Wire America supplies VFD cable custom cut-to-length by the foot, allowing you to order the exact footage your takeoff requires instead of buying expensive full master spools. Most standard orders process and ship within 24 to 48 hours—whether you need a 50-foot drop for an isolated pump or multiple spools for a plant overhaul—helping you eliminate job site scrap and stay on schedule.