Page 1
INSTRUCTION SHEET
TRENCH INSTALLATION
Mix GEM into a slurry form by using a standard
1.
cement mixer or mix in a bucket, mixing box,
wheelbarrow, etc. Use 1.5 to 2 gallons (5.7 to
7.6 liters) of clean, potable water per bag or
GEM Resistivity ≤ 20 Ohm-cm; ASTM D991-89
4" (10cm)
Complies to IEC 62561-7
30"
Trench
21
2" (5 cm)
bucket of GEM. (See Note 1 on page 2) Do not
mix GEM with salt water.
Spread out enough GEM to uniformly cover
2.
bottom of trench - about 2 in (5 cm) thick. Let
the GEM harden to prevent the conductor from
sinking to the bottom fo the trench.
Place conductor on top of the GEM (See Note
3.
Ground
Conductor
3
GEM
GEM
2" (5 cm)
4
GEMGEM
2 on page 2).
Spread more GEM on top of conductor to
4.
completely cover conductor - about 2 in (5
4" (10 cm)
Soil
Soil Backfill
cm) thick. Allow GEM to harden before filling
the trench with soil backfill.
Carefully cover the GEM with soil making sure
5.
5 6
not to expose the conductor.
Backfill the trench with soil.
6.
Table 1 - Estimated linear distance of ground conductor covered with each bag of GEM
Total Thickness of GEM
Trench Width
4 inches (10.2 cm)
6 inches (15.2 cm)
8 inches (20.3 cm)
10 inches (25.4 cm)
12 inches (30.5 cm)
A 25 lb. bag of GEM will cover 2.5 linear feet (1.0 m) of conductor length for a 4" wide (10.2 cm), 4" thick (10.2
cm) convering [2" (5.1 cm) below and 2" (5.1 cm) above conductor], based on 63.5 lb/cu ft (1017 kg/m3)
4 inches (10.2 cm) 5 inches (12.7 cm) 6 inches (15.2 cm)
3.5 feet (1.0 m) 2.8 feet (0.8 m) 2.3 feet (0.7 m)
2.3 feet (0.7 m) 1.8 feet (0.5 m) 1.5 feet (0.4 m)
1.8 feet (0.5 m) 1.4 feet (0.4 m) 1.1 feet (0.3 m)
1.4 feet (0.4 m) 1.1 feet (0.3 m) 0.9 feet (0.3 m)
1.2 feet (0.3 m) 0.9 feet (0.3 m) 0.7 feet (0.2 m)
WARNING
nVent ERICO products shall be installed and used only as
1.
indicated in the nVent ERICO product instruction sheets and
training materials. Instruction sheets are available at
www.erico.com and from your nVent ERICO customer service
representative.
nVent ERICO products must never be used for a purpose other
2.
than the purpose for which they were designed.
All instructions must be
3.
and safe installation and performance.
Improper installation, misuse, misapplication or other failure to
4.
completely follow nVent ERICO's instructions and warnings
may cause product malfunction, property damage, serious
bodily injury or 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.
GEM contains hydraulic cements and should be handled with the
same precautions as used with Portland Cement.
WARNING:
nVent products shall be installed and used only as indicated in nVent product instruction sheets and training materials. Instruction sheets are available at
1.
www.nVent.com
nVent 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.
2.
All instructions must be
3.
Improper installation, misuse, misapplication or other failure to completely follow nVent's instructions and warnings may cause product malfunction, property
4.
damage, serious bodily injury and/or death, and void your warranty.
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.
nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
specifications without prior notice.
completely
and from your nVent customer service representative.
completely
followed to ensure proper
followed to ensure proper and safe installation and performance.
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.
Risk of serious damage to eyes. Wear eye protection. If GEM
1.
gets into eye, rinse immediately and repeatedly with water
and seek prompt medical attention.
Do NOT breathe dust. Wear respiratory protection when
2.
exposed to GEM dust.
Protect skin with boots, gloves, clothing and eye/face
3.
protection.
Avoid prolonged contact of GEM with skin. Wash skin promptly
4.
after any contact with GEM.
If GEM is ingested, drink large quantities of water immediately
5.
and then induce vomiting. Get medical attention
immediately.
Do NOT smoke when using GEM.
6.
Do NOT expose GEM to an open flame.
7.
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Page 2
INSTRUCTION SHEET
VERTICAL CYLINDRICAL HOLE INSTALLATION
Auger a 4-inch (10 cm) or larger diameter hole
1.
to a depth of 6 inches (15 cm) shorter than the
length of the ground rod.
Place ground rod into the augered hole and
2.
drive 6 inches (15.2 cm) into bottom of the hole.
The top of the ground rod will be approximately
6 inches (15 cm) below grade. At this time,
make connections to ground rod using nVent
ERICO CADWELD connections (See note 2 on
page 2).
Mix GEM into a slurry form by using a standard
3.
cement mixer or mix in a bucket, mixing box,
wheelbarrow, etc. Use 1.5 to 2 gallons (5.7 to
7.6 liters) of clean, potable water per bag or
bucket of GEM. (See Note 1 on page 2) Do not
mix GEM with salt water. Installation of GEM in a
dry state is acceptable for vertical ground rod
applications.
Pour the appropriate amount of GEM (See
4.
Table 2) around the ground rod to ensure the
GEM material completely fills the hole.
Let the GEM harden before covering the hole
5.
with soil or installing an inspection well.
Complies to IEC 62561-7
GEM Resistivity ≤ 20 Ohm-cm; ASTM D991-89
Auger Hole
Diameter
1
6" (15.2 cm)
Shorter than
Ground Rod
6" (15.2 cm)
3 4
GEM
Packed Around
Ground Rod
6" (15.2 cm)
2
Ground Rod
6" (15.2 cm)
Soil Backfill
Note 1:
Excess standing water must be removed from the trench or
the augered hole before GEM installation.
Note 2:
4 inches (10 cm) of insulating material must be applied to
the conductors and ground rods exiting the GEM, starting 2 inches
(5 cm) inside the GEM.
Table 2 - Estimated number of bags to encase each ground rod in GEM
Diameter
4 inches (10.2 cm)
8 inches (20.3 cm)
12 inches (30.5 cm)
*8' (2.4 m) minimum rod length required to be in contact with soil (or GEM). Per NEC® 250-52
Depth of Hole
5 feet (1.5 m)
8 feet (2.4 m)
10 feet (3.0 m)
5 feet (1.5 m)
8 feet (2.4 m)
10 feet (3.0 m)
5 feet (1.5 m)
8 feet (2.4 m)
10 feet (3.0 m)
No. of Bags
2
2
3
5
8
9
10
16
20
Customer Support
Support representatives are available to answer any product or application questions you may have; visit
www.erico.com to find a phone number for your nearest customer support respresentative.
NEC is a registered trademark of, and National Electrical Code (NEC) standard is a copyright of the National FIre Protection Association.
nVent, nVent CADDY, nVent ERICO Cadweld, nVent ERICO Critec, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its
global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change
specifications without prior notice.
TECHNICAL SUPPORT
www.nVent.com
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© 2005-2018 nVent All Rights Reserved
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