GEM - Ground Enhancement Material
 Ground Enhancement Material (GEM) from ERICO is a superior conductive material that solves
your toughest grounding problems. Third-party testing has been completed to
verify that GEM conforms to IEC 62561-7. This standard introduces a benchmark
for corrosion and electrical performance that has been absent from the industry
to date. GEM
is a low-resistance, non-corrosive, carbon concrete that improves grounding
effectiveness, especially in areas of poor conductivity. The resistivity of GEM
is less than 2 ohm-cm; which is less than 1% the resistivity for bentonite clay.GEM
contains portland cement, which hardens when set, making it permanent,
maintenance-free and it will never leach or wash away. GEM improves grounding
effectiveness regardless of soil conditions. It is the ideal material to use in
areas of poor conductivity, such as rocky ground, mountain tops and sandy soil.
Features - Resistivity less than 2 ohm-cm
- Conforms to IEC 62561-7 Standard
- Once in its “set” form, maintains constant resistance for the “life” of the ground system
- Performs in all soil conditions even during dry spells
- Permanent - does not dissolve, decompose or leach out with time
- Meets (USA) Environmental Protection Authority requirements for landfill
- Can be installed using Trench or Ground Rod Backfill methods
Applications GEM is ideal for areas with poor conductivity such as rocky ground, mountain tops, sandy soil and areas of moisture variation.
More Information GEM Calculator
Download the latest version of the GEM Software Calculator. Available in four languages (English, French, German and Spanish), the calculator estimates the amount of GEM required for an installation and converts Metric and Imperial measurement units. How to Specify - Ground enhancement material in its set form shall have a resistivity of not more than 2 ohm-cm
- Ground enhancement material must be permanent and maintenance-free (no recharging with salts or chemicals which may be corrosive) and maintain its earth resistance with time
- It must set up firmly and not dissolve or decompose or otherwise pollute the soil or the local water table
- The ground enhancement material shall be suitable for installation in a slurry form
- The ground enhancement material shall not depend on the continuous presence of water to maintain its conductivity
- Must conform to IEC 62561-7 Standard
Ground Enhancement Material (GEM) Installation Methods Trench Installation A 11.1 kg bag of GEM will cover 2.1m (7 linear feet) of conductor length for a 10.2cm - (4-inch) wide, 5.1cm (2-inch) thick covering 2.5cm (1 inch) below and 2.1cm (1 inch) above the conductor), based on 1017 kg /m3 (63.5 lb/cu ft).
Full installation instructions will be supplied with product when shipped.
Ground Rod Backfill Installation * 2.44m (8 foot) minimum rod length required to be in contact with the soil (or GEM). As per NEC®250-83c.
Full installation instructions will be supplied with product when shipped. NEC is a registered trademark of, and National Electrical Code (NEC) standard is a copyright of the National Fire Protection Association, Inc.
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Warning, Warranty and Limitation of Liability
WARNING
ERICO products shall be installed and used only as indicated in ERICO's product instruction sheets and
training materials. Instruction sheets are available at www.erico.com and from your ERICO customer service
representative. 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.
WARRANTY
ERICO products are warranted to be free from defects in material and workmanship at the time of shipment.
NO OTHER WARRANTY, WHETHER EXPRESS OR IMPLIED (INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE), SHALL EXIST IN CONNECTION WITH THE SALE OR USE OF ANY ERICO PRODUCTS. Claims for errors,
shortages, defects or nonconformities ascertainable upon inspection must be made in writing within 5 days
after Buyer's receipt of products. All other claims must be made in writing to ERICO within 6 months from the
date of shipment or transport. Products claimed to be nonconforming or defective must, upon ERICO's prior
written approval in accordance with its standard terms and procedures governing returns, promptly be returned
to ERICO for inspection. Claims not made as provided above and within the applicable time period will be
barred. ERICO shall in no event be responsible if the products have not been stored or used in accordance
with its specifications and recommended procedures. ERICO will, at its option, either repair or replace
nonconforming or defective products for which it is responsible or return the purchase price to the Buyer.
THE FOREGOING STATES BUYER'S EXCLUSIVE REMEDY FOR ANY BREACH OF ERICO WARRANTY AND FOR ANY CLAIM, WHETHER
SOUNDING IN CONTRACT, TORT OR NEGLIGENCE, FOR LOSS OR INJURY CAUSED BY THE SALE OR USE OF ANY PRODUCT.
LIMITATION OF LIABILITY
ERICO excludes all liability except such liability that is directly attributable to the willful or gross
negligence of ERICO's employees. Should ERICO be held liable its liability shall in no event exceed the
total purchase price under the contract. ERICO SHALL IN NO EVENT BE RESPONSIBLE FOR ANY LOSS OF BUSINESS OR
PROFITS, DOWNTIME OR DELAY, LABOR, REPAIR OR MATERIAL COSTS OR ANY SIMILAR OR DISSIMILAR CONSEQUENTIAL LOSS
OR DAMAGE INCURRED BY BUYER.
Due to a policy of continued product development, specifications are subject to change without notice.
CADDY, CADWELD, CRITEC, ERICO, ERIFLEX, ERITECH, and LENTON are registered trademarks of ERICO
International Corporation.
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