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INSTRUCTION SHEET

GROUND ENHANCEMENT MATERIAL (GEM)

TRENCH INSTALLATION

1. Premix GEM into a slurry form. Use 1.5 to 2 gallons (5.7 to 7.6 liters)

of clean potable water per pail of GEM.

2. To mix GEM into a slurry form, use a standard cement mixer or

mix in the GEM pail, a mixing box, wheelbarrow, etc. Use 1.5 to 2

gallons (5.7 to 7.6 liters) of clean-potable water per pail of GEM.

Do not mix GEM with salt water.

3. Spread out enough GEM to uniformly cover bottom of

trench – about 1 inch (2.5 cm) deep. (See table)

4. Place conductor on top of GEM. (See Note 1)

5. Spread more GEM on top of conductor to completely cover

conductor – about 1 inch (2.5 cm) deep. Allow GEM to harden.

Wait 30 minutes to 1 hour before filling the trench with soil backfill.

6. Carefully cover the GEM with soil to a depth of about 4 inches

(10 cm), making sure not to expose the conductor.

7. Tamp down the soil, then fill in the trench.

Note 1: Wait for the GEM to harden, about 15 to 20 minutes, before

placing the conductor on top of the GEM. You must apply

4 inches (10 cm) of insulating material to the conductors and

ground rods exiting the GEM, starting 2 inches (5 cm) inside

the GEM.

Note 2: Excess standing water must be removed from trench.

NEC is a registered trademark of, and National Electrical Code (NEC) standard is a copyright of the National Fire Protection Association, Inc.

CADDY, CADWELD, CRITEC, ERICO, ERIFLEX, ERITECH, and LENTON are registered trademarks of ERICO International Corporation.

WARNING

1. ERICO products shall be installed and used only as indicated

in ERICO product instruction sheets and training materials.

Instruction sheets are available at www.erico.com and from

your ERICO customer service representative.

2. ERICO products must never be used for a purpose other than

the purpose for which they were designed or in a manner that

exceeds specified load ratings.

3. All instructions must be completely followed to ensure proper

and safe installation and performance.

4. Improper installation, misuse, misapplication or other failure to

completely follow ERICO’s instructions and warnings may cause

product malfunction, property damage, serious bodily injury

and death.

SAFETY INSTRUCTIONS: All governing codes and regulations

and those required by the job site must be observed. Always use

appropriate safety equipment such as eye protection, hard hat,

and gloves as appropriate to the application.

Ground Enhancement Material (GEM) contains hydraulic cements

and should be handled with the same precautions as used with

portland cement.

PLEASE OBSERVE THESE SAFETY PRECAUTIONS

KEEP OUT OF REACH OF CHILDREN

CAUTION

Contact with GEM is irritating to respiratory system and skin.

Avoid contact, ingestion or breathing the product.

1. Risk of serious damage to eyes. Wear eye protection.

If GEM gets into the eye, rinse immediately and repeatedly

with water and seek prompt medical attention.

2. Do not breathe dust. Wear respiratory protection when

exposed to GEM dust.

3. Protect skin with boots, gloves, clothing and eye/face protection.

4. Avoid prolonged contact of GEM with skin. Wash skin promptly

after any contact with GEM.

5. If GEM is ingested, drink large quantities of water immediately

and then induce vomiting. Get medical attention immediately.

6. Do not smoke when using GEM.

7. Do not expose GEM to open flame.

GEM

1”

2.5 cm

4”

10 cm

Soil

Soil Backfill

4”

10 cm

30”

Trench

75 cm

GEM

1”

2.5 cm

GEM

Ground Conductor

Complies to IEC 62561-7.

GEM Resistivity ≤ 2 Ohm-cm; 2-Electrode Method.

Estimated linear feet of ground conductor covering with each pail of GEM.

Total Thickness of GEM (inches / cm)

Trench Width

(inches / cm)

1” 2.5 cm 2” 5.0 cm 3” 7.5 cm 4” 10.0 cm

4” 10.0 cm 14.0’ 4.27 m 7.0’ 2.13 m 4.7’ 1.43 m 3.5’ 1.06 m

6” 15.2 cm 9.3’ 2.83 m 4.7’ 1.43 m 3.1’ 0.94 m 2.3’ 0.70 m

8” 20.3 cm 7.0’ 2.13 m 3.5’ 1.06 m 2.3’ 0.70 m 1.8’ 0.55 m

10” 25.4 cm 5.6’ 1.70 m 2.8’ 0.85 m 1.9’ 0.57 m 1.4’ 0.42 m

12” 30.5 cm 4.7’ 1.43 m 2.3’ 0.70 m 1.6’ 0.48 m 1.2’ 0.37 m

A 25-pound pail of GEM will cover 7 linear feet (2.1 m) of conductor length for a 4-inch-wide (10 cm), 2-inch-thick

(5 cm) covering (1 inch (2.5 cm) below and 1 inch (2.5 cm) above conductor), based on a density of 63.5 lb/cu.ft.

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INSTRUCTION SHEET 1

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Page 1 - INSTRUCTION SHEET

INSTRUCTION SHEET GROUND ENHANCEMENT MATERIAL (GEM)TRENCH INSTALLATION 1. Premix GEM into a slurry form. Use 1.5 to 2 gallons (5.7 to 7.6 liters) of

Page 2

TECHNICAL SUPPORTwww.erico.comIP7945_BE1040IS12WWENGROUND ROD BACKFILL INSTALLATION1. Auger a 3-inch (7.5 cm) or larger diameter hole to a depth of

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Erico GEM Manuel d'utilisateur

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