ZERO GROUND HFES® For Mining Applications

The ZERO GROUND® High Frequency Extraction System (HFES), which significantly reduces high frequency VFD generated currents, has been formally approved by the U.S. Dept. of Labor, Mining and Safety Health Administration (MSHA) for use in underground and surface mines located in the United States.

ZERO GROUND HFES has also been approved by the Bureau of Mine Safety, Pennsylvania Department of Environmental Protection, and has been issued a “P” number to be used in conjunction with the MSHA approval number for the ZERO GROUND HFES solution.

MSHA Approval Number: P07-KA070024-MSHA

HFES Offers Unequaled Safety Benefits and Reduces Unplanned Downtime

Variable Frequency Drive (VFD) generated high frequency ground currents are present wherever VFD’s are in use. These damaging VFD generated currents cause arcing, sparking and shocking, and adversely affect the operation and accuracy of sensitive electronic and communications equipment, including environmental sensors used in Mine-Wide Monitoring Systems (MWMS). Although VFD generated currents cannot be eliminated, ZERO GROUND HFES is the only tested and proven cabling and grounding system to reduce VFD generated currents to safe levels, by directing these harmful currents away from hazardous locations and sensitive equipment.

HFES Offering and Resources for Mining Applications
For system cable assembly repair or extension, download Connection Box part number pdf for Bill of Materials and Instructions

HFES System Specification	10HP or Less @ 33AMPS
HFES Cable Assembly Part Number	ZH1033
HFES Connection Box Part Number	ZH1033-CB1033 (pdf)
HFES System Specification	50 HP or Less @ 70 AMPS
HFES Cable Assembly Part Number	ZH5070
HFES Connection Box Part Number	ZH5070-CB5070 (pdf)
HFES System Specification	125 HP or Less @ 205 AMPS
HFES Cable Assembly Part Number	ZH125205
HFES Connection Box Part Number	ZH125205-CB125205 (pdf)

General Information

The HFES cable assembly is comprised of a cable (inner component) within a flexible metallic tube (outer component), which must be used together.

P07-KA070024-MSHA approval requires Zero Ground marked cable and flexible metallic tube components. No substitutions allowed.

The P07-KA070024-MSHA HFES System is not to be used on permissible equipment.

The Zero Ground HFES System is not to be used where permissible equipment is required.

The Zero Ground HFES Connection Box is not to be used where permissible equipment is required.

 

HFES System Cable Assembly Design**:

UL Listed Materials

Supports link distances in excess of 500 ft.

Assembly rated for use on “Input" to and “Output" from the drive

Simple Terminations

Uses NO active components such as Filters

Uses all Standard Off-The-Shelf Industry Connectors

Installation Method Meets N.E.C. Section 250

 

 

* “ZERO GROUND” and "HFES" are Federal Registered Trademarks. ZERO GROUND patent applied for.

**Complete Specifications Available