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How to Ground an ESD Floor[11 min read, 7 min video]

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how to ground an esd floor

[11 min read, 7 min video]

How to Ground an ESD Floor

[11 min read, 7 min video]

Post Summary 

This how-to article explains several ways to properly ground an ESD floor. Detailed instructions are supported by illustrations for an easy-to-follow field guide.

  • Grounding Method 1: Grounding to an ESD Electrical Outlet
  • Grounding Method 2: Grounding to a Natural Earth Ground
  • Grounding Method 3: Grounding to an Earth Ground
  • Helpful Definitions
Ground an ESD Floor

Grounding an ESD floor is straightforward and easy.

Conductive adhesive eliminates the need for expensive copper equipotential grounding grids of the past.

Copper Equipotential Grounding Grids
Copper equipotential grounding grids are no longer necessary.

Grounding CopperThe conductive adhesive is linked to ground with copper connector straps placed at the perimeters of the room. The straps, usually about 24” long, can be attached to electrical outlets, conduit, building steel, or a dedicated grounding bar. Only one connection is necessary for every 1000 square feet of contiguous ESD flooring.

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Grounding Method 1: Easiest

Grounding to an ESD Electrical Outlet

Grounding conductive and static-dissipative tile and sheet flooring to an AC electrical outlet is the easiest and most common grounding method.

Grounding Materials

Caution: Only use electrical receptacles/outlets that have been previously tested using an approved circuit tester complying with CSA and/or UL standards.

Required materials:

  • Screw driver
  • 24-inch copper grounding strap
  • ESD flooring
  • Conductive adhesive.

One copper grounding strap should be installed for every 1000 square feet of ESD flooring. Each room should have at least one grounding strap.

Step 1

Grounding Installation-1

Remove center screw on cover of AC electrical outlet using a screw driver.

Step 2

Grounding Installation-2

Locate and remove grounding screw inside AC electrical outlet.

Step 3

Grounding Installation-3

Punch small hole in 24″ copper grounding strap (provided with StaticWorx ESD flooring). The hole should be smaller than the head of the screw removed in Step 2.

Step 4

Grounding Installation-4

Secure copper strap to the AC electrical outlet with the same screw removed in step 2.

Step 5

Grounding Installation-5Allow 24″ copper strap to run down wall to subfloor (concrete, etc.).

Fold copper at a 90-degree angle at the point where the wall meets the floor. Lay remainder of copper strap flat on the subfloor. The strap can be placed directly on the concrete subfloor in advance of installation or pressed into the conductive adhesive during installation.

At least 6 inches of copper should contact the floor. If the copper is applied directly to bare concrete or another subfloor, it will need to be covered with conductive adhesive during the installation.

Step 6

Grounding Installation-6

Cover copper strap on floor with conductive adhesive and new flooring material. For a cleaner installation, copper should be covered by wall base.

Step 7

Grounding Installation-7

Finish installation by re-attaching AC outlet cover with screw removed in step 1.

One copper grounding strap should be installed for every 1000 square feet of ESD flooring. Each room should have at least one grounding strap.

Step 1

Grounding Installation-1

Remove center screw on cover of AC electrical outlet using a screw driver.

Step 2

Grounding Installation-2

Locate and remove grounding screw inside AC electrical outlet.

Step 3

Grounding Installation-3

Punch small hole in 24″ copper grounding strap (provided with StaticWorx ESD flooring). The hole should be smaller than the head of the screw removed in Step 2.

Step 4

Grounding Installation-4

Secure copper strap to the AC electrical outlet with the same screw removed in step 2.

Step 5

Grounding Installation-5Allow 24″ copper strap to run down wall to subfloor (concrete, etc.).

Fold copper at a 90-degree angle at the point where the wall meets the floor. Lay remainder of copper strap flat on the subfloor. The strap can be placed directly on the concrete subfloor in advance of installation or pressed into the conductive adhesive during installation.

At least 6 inches of copper should contact the floor. If the copper is applied directly to bare concrete or another subfloor, it will need to be covered with conductive adhesive during the installation.

Step 6

Grounding Installation-6

Cover copper strap on floor with conductive adhesive and new flooring material. For a cleaner installation, copper should be covered by wall base.

Step 7

Grounding Installation-7

Finish installation by re-attaching AC outlet cover with screw removed in step 1.

Ground Plug AdapterAny electrical outlet can be tested using a ground plug tester.

A Ground Plug Adapter is equipped with three indicating lights. The ONLY indication that is acceptable for the Ground Plug Adapter to be in use is with the two outer “CIRCUIT OK” lights energized, i.e., Lights #1 and #3 ON, Light #2 OFF.

*———-CIRCUIT OK———*

Light #1Light #2Light #3
YellowRedClear

If any other condition exists, do not use the receptacle or the Ground Plug Adapter until tested and approved by a qualified electrician.

Examples of wiring defects include, but are not limited to the conditions described below:

  1. OPEN GROUND WIRE – The equipment grounding conductor is not complete.
  2. REVERSE POLARITY – The hot and the neutral circuit conductors are reversed.
  3. OPEN HOT WIRE – The hot circuit conductor is open from a blown fuse, tripped circuit breaker, switch off, broken wire, etc.
  4. OPEN NEUTRAL WIRE – The neutral circuit conductor is open.
  5. HOT AND GROUND REVERSED – The hot circuit conductor and the grounding conductor are reversed.
  6. HOT ON NEUTRAL AND HOT OPEN – The hot circuit conductor is connected to neutral terminal and the hot terminal is unwired.

*———-CIRCUIT OK———*

Light #1Light #2Light #3
YellowRedClear

If any other condition exists, do not use the receptacle or the Ground Plug Adapter until tested and approved by a qualified electrician.

Examples of wiring defects include, but are not limited to the conditions described below:

  1. OPEN GROUND WIRE – The equipment grounding conductor is not complete.
  2. REVERSE POLARITY – The hot and the neutral circuit conductors are reversed.
  3. OPEN HOT WIRE – The hot circuit conductor is open from a blown fuse, tripped circuit breaker, switch off, broken wire, etc.
  4. OPEN NEUTRAL WIRE – The neutral circuit conductor is open.
  5. HOT AND GROUND REVERSED – The hot circuit conductor and the grounding conductor are reversed.
  6. HOT ON NEUTRAL AND HOT OPEN – The hot circuit conductor is connected to neutral terminal and the hot terminal is unwired.
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Alternative Grounding Methods

Grounding Method 2: Grounding to a Natural Earth Ground

If the floor will be installed on-grade or below grade, a copper grounding rod can be driven into the ground, creating an earth ground for the floor.

Step 1

Grounding RodDrive the 4- to 6-foot rod into the ground until only 2 or 3 inches of the rod remains exposed.

Step 2

Attach the copper-grounding strap to the exposed end of the rod using a grounding clamp, usually sourced from the same manufacturer as the grounding rod (refer to www.stormgrounding.com.) If necessary, a #10 or #12 wire can be attached to the grounding rod.

Step 3

Run the wire from the rod to the grounding strap, and tie it to the strap with a wire nut.

If the floor will be installed on-grade or below grade, a copper grounding rod can be driven into the ground, creating an earth ground for the floor.

Step 1

Grounding RodDrive the 4- to 6-foot rod into the ground until only 2 or 3 inches of the rod remains exposed.

Step 2

Attach the copper-grounding strap to the exposed end of the rod using a grounding clamp, usually sourced from the same manufacturer as the grounding rod (refer to www.stormgrounding.com.) If necessary, a #10 or #12 wire can be attached to the grounding rod.

Step 3

Run the wire from the rod to the grounding strap, and tie it to the strap with a wire nut.

Grounding Method 3: Grounding to an Earth Ground

If the building is constructed with exposed steel support columns, the copper grounding strap can be attached directly to one or more of the columns.

Step 1

Steel Support ColumnsAffix the grounding strap to the tile as described in paragraph one.

Step 2

Drill a hole in the support column.

Step 3

With a grounding screw or clamp, attach the end of the copper strap directly to the column. Or mount a grounding clamp to the column and use it to clamp the copper strap.

Copper grounding straps should be attached to aluminum studs using sheet metal screws and a washer.

Grounding Strap

Step 4

A continuity test should be conducted with a volt ohm meter (VOM) to confirm a compliant electrical ground connection between the copper strap and electrical ground.

Bus bars
Bus Bars

Copper bus bars can serve as a dedicated Common Point ESD Flooring Ground Connection.

I Beams

Copper ground straps may also be adhered to structural I beams.

Note: The beams must be bare metal. Paints and coatings must be removed from beams prior to attaching copper straps.

If the building is constructed with exposed steel support columns, the copper grounding strap can be attached directly to one or more of the columns.

Step 1

Steel Support ColumnsAffix the grounding strap to the tile as described in paragraph one.

Step 2

Drill a hole in the support column.

Step 3

With a grounding screw or clamp, attach the end of the copper strap directly to the column. Or mount a grounding clamp to the column and use it to clamp the copper strap.

Copper grounding straps should be attached to aluminum studs using sheet metal screws and a washer.

Grounding Strap

Step 4

A continuity test should be conducted with a volt ohm meter (VOM) to confirm a compliant electrical ground connection between the copper strap and electrical ground.

Bus bars
Bus Bars

Copper bus bars can serve as a dedicated Common Point ESD Flooring Ground Connection.

I Beams

Copper ground straps may also be adhered to structural I beams.

Note: The beams must be bare metal. Paints and coatings must be removed from beams prior to attaching copper straps.

Helpful Definitions

AC Equipment Ground

a) The ground point at which the equipment grounding conductor is bonded to any piece of equipment, at the equipment end of the conductor in a single-phase 120VAC electrical service.

b) The 3rd wire (green/green with yellow strap) terminal of a receptacle.

c) The entire low impedance path (electrically equivalent to the equipment grounding conductor) from a piece of electrical equipment to the neutral bus at the main service equipment.

Common Connection Point

A device or location (less than 1 ohm within itself) where the conductors of two or more ESD technical elements are connected in order to bring the ungrounded ESD technical elements to the same electrical potential through equipotential bonding.

Common Point Ground

A grounded device or location where the conductors of one or more technical elements are bonded.

Ground

a) A conducting connection, whether intentional or accidental between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.

b) The position or portion of an electrical current at zero potential with respect to the earth.

c) A conducting body, such as the earth or the hull of a steel ship used as a return path for electric currents and as an arbitrary zero reference point.

ESDA Technical Requirements – Grounding

Equipment Grounding Conductor ANSI/ESD S6.1 < 1.0 ohm impedance
Auxiliary Ground ANSI/ESD S6.1 < 25 ohms to the Equipment Grounding Conductor
Equipotential Bonding ANSI/ESD S6.1 < 1.0 x 10E9 ohms(3)

AC Equipment Ground

a) The ground point at which the equipment grounding conductor is bonded to any piece of equipment, at the equipment end of the conductor in a single-phase 120VAC electrical service.

b) The 3rd wire (green/green with yellow strap) terminal of a receptacle.

c) The entire low impedance path (electrically equivalent to the equipment grounding conductor) from a piece of electrical equipment to the neutral bus at the main service equipment.

Common Connection Point

A device or location (less than 1 ohm within itself) where the conductors of two or more ESD technical elements are connected in order to bring the ungrounded ESD technical elements to the same electrical potential through equipotential bonding.

Common Point Ground

A grounded device or location where the conductors of one or more technical elements are bonded.

Ground

a) A conducting connection, whether intentional or accidental between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth.

b) The position or portion of an electrical current at zero potential with respect to the earth.

c) A conducting body, such as the earth or the hull of a steel ship used as a return path for electric currents and as an arbitrary zero reference point.

ESDA Technical Requirements – Grounding

Equipment Grounding Conductor ANSI/ESD S6.1 < 1.0 ohm impedance
Auxiliary
Ground
ANSI/ESD S6.1 < 25 ohms to the
Equipment Grounding
Conductor
Equipotential Bonding ANSI/ESD S6.1 < 1.0 x 10E9 ohms(3)

Please note: StaticWorx carpet, tile, and sheet flooring installations utilize conductive adhesives. Copper ground straps are supplied with every StaticWorx flooring shipment.

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Further Reading

What is ESD Flooring?
A Guide to ESD Flooring Selection
Selecting & Specifying an ESD Floor
Installation and Maintenance
Technical Information
What is ESD Flooring?
  • What is ESD Flooring, How Does it Work and How Do I Choose One?
  • 7 Myths About ESD Flooring
A Guide to ESD Flooring Selection
  • Guide: Home
  • Flooring Specification Checklist
  • ESD Flooring Decision Tree
  • Walking Body Voltage
  • Resistance Requirements and Testing
  • Comparing Types of Flooring
  • Industry Standards and Test Methods
Selecting & Specifying an ESD Floor
  • 7 Common Mistakes Selecting an ESD floor
  • Avoid Costly Failures: What to Know When Specifying ESD Flooring
  • Choosing ESD Flooring for:
    • Mission-critical Spaces
    • Electronics Manufacturing and Handling Applications
    • Cleanrooms
  • ESD Footwear: What Is It and When Is It Necessary?
  • Facility Managers’ Guide to Selecting ESD Flooring
  • The Need for Due Diligence in Specifying Static-Free Flooring
  • Standard of Care for Specifying Floors in Mission-Critical Spaces
  • Static-Control Footwear for Electronics Manufacturing and Handling Applications
  • Understanding the Hidden Costs of ESD Flooring
Installation and Maintenance
  • Conductive Adhesive
  • Glue-Free ESD Floors
  • Installing a New ESD Floor Over an Existing Floor—without shutting down the space
  • Installing ESD Floors
  • Maintaining ESD Floors
Technical Information
  • The Case Against Overly Conductive Flooring
  • Conductive vs Dissipative
  • Electrical Resistance
  • Electrical Resistance in Mission-Critical Spaces
  • ESD Standards and Tests
  • Resistance, Resistivity, and Real World Application
  • Walking Body Voltage

Resources

Flooring Guide
Article Hub
ESD Standards
FAQs
ESD Glossary
Media
Flooring Guide
Article Hub
ESD Standards
FAQs
ESD Glossary
Media

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