About ZERO GROUND HFES® Development;

Since 1998, ZERO GROUND HFES has been used to safely wire all input and output connections included with large switching power supplies. HFES addresses issues associated with Adjustable Speed Drives in BJT, IGCT and IGBT technology(s), in conjunction with motors, motor cables, as well as PE ground grids, and rapid rise pulse phenomenon.

ZERO GROUND has invested $3.5 million in Research, Development, Technical and Product Testing. Our experienced staff of engineers has over 175 years of industry experience with drives, motors, magnet wire, cable and conduit.

ZERO GROUND HFES meets all requirements of UL Type TC and NEC 250 grounding. Testing was completed (2002) at Toshiba International Corporations’ Government Certified NVLAP Lab in Houston, TX. The first HFES Beta Site was installed in 1999, and our Beta Sites continue to operate successfully. The NVLAP Lab test data, coupled with the Beta Site information, validated claims for our US and International Patents. The components in HFES are UL (Underwriters Laboratories) listed. ZERO GROUND has diligently worked with the United States Mining Safety and Health Administration (MSHA), who has reviewed our data and visited our Beta Sites to verify claims. MSHA has now approved ZERO GROUND HFES for use in U.S. mines.

All HFES inner component cables are rated for 2000V AC RMS. The maximum horsepower (and voltage) this can be used for is: 1 - 500 HP @ 480 V, 3 phase (0 - 50 KHz) and 1 - 250 HP @ 240 V, 3 phase (0 - 50 KHz). HFES is being successfully used in the field, with motors as follows:

5 HP @ 240 V, 3 Phase
20 HP @ 480 V, 3 Phase
50 HP @ 480 V, 3 Phase
125 HP @ 480 V, 3 Phase

All of these field applications are running drives (ASD’s).

ZERO GROUND HFES offers Safety & Reliability by reducing High Frequency Ground Currents to Zero and by directing fault currents away from hazardous locations to be safely dealt with. In addition HFES significantly reduces unplanned downtime*, due to issues associated with ASD’s / motor installations.

*Unplanned Downtime – Cost of Labor, Materials, Lost Equipment (Repair or Replacement) and Lost Product