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GEM Ground Enhancement Material

Ground Enhancement Material (GEM) is a superior conductive material that solves your toughest grounding problems. It is the ideal material to use in areas of poor conductivity, such as rocky ground, mountain tops and sandy soil. GEM dramatically reduces earth resistance and impedance measurements. Furthermore, GEM may reduce the size of the grounding system where conventional methods are unsatisfactory. Once installed, GEM is maintenance-free, not requiring periodic charging or the presence of water to maintain its conductivity.

Third-party testing has been completed to verify that GEM conforms to IEC® 62561-7. This standard introduces a benchmark for electrical performance and corrosion of earth enhancement materials that has been absent from the industry to date.

nVent ERICO offers GEM Calculator software that provides resistivity values for common GEM applications and can help estimate the amount of GEM required for an installation. It operates in four languages - English, Spanish, French and German - and performs calculations in Imperial or Metric units. The GEM Calculator is available for download on our website at erico.com.

Need technical support or a quote? We're here to help.

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Podrobnosti

Vlastnosti

Maintains constant resistance for the life of the system once in its set form
Performs in all soil conditions even during dry spells
Does not require periodic charging treatments or placement
Does not require the continuous presence of water to maintain its conductivity
Fully sets within 3 days, fully cures within 28 days
Does not dissolve, decompose, or leach out with time
Non-corrosive
Reduces vandalism and theft since conductors are hard to remove from concrete
Easy-to-handle 25 lb (11.3kg) bags or buckets
Requires only one person to install
Exceeds IEC® 62561-7 which sets the benchmark for corrosion, leaching, sulfur content, and other environmental regulations
Complies to the U.S. Environmental Protection Agency (EPA) Toxicity Characteristic Leaching Procedure (TCLP), EPA test method 1311
Can be installed using trench or ground rod backfill methods

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Specifikace

Unit Weight

25 lb

Data Copied

Metrické | Imperiální

Estimated Linear Feet of Ground Conductor Covering with Each Bag of GEM
Trench Width	Total Thickness of GEM
Trench Width	10.2 cm	12.7 cm	15.2 cm
10 cm	1.0 m	0.8 m	0.7 m
15.2 cm	0.7 m	0.5 m	0.4 m
20.3 cm	0.5 m	0.4 m	0.3 m
25.4 cm	0.4 m'	0.3 m	0.3 m
30.5 cm	0.3 m	0.3 m	0.2 m

Suggested Specifications
Parameter	Recommended Values	Test Method
Standards Compliance		Full compliance to IEC 62561-7 EPA Toxicity Characteristic Leaching Procedure (TCLP), test method 1311
Leaching	Arsenic < 1.5 mg/L, Barium < 60 mg/L, Cadmium < 0.15 mg/L, Chromium < 3.0 mg/L, Lead < 1.5 mg/L, Mercury < 0.06 mg/L, Selenium < 1.0 mg/L	EC 62561-7 EN 12457-2
Sulfur Content	< 2%	ISO 14869-1
Resistivity	<2 Ω-cm for powder <20 Ω-cm for mixed and cured material	Compressed powder according to ASTM G187-12 Mixed and cured per ASTM D991-89
Corrosion Performance	For copper-plated earth electrodes, the polarization resistance shall be > 8 Ω x m2 for aggressive environments For galvanized earth electrodes, the polarization resistance shall be > 7.6Ω x m2 for aggressive environments	IEC 62561-7, Sec 5.5, aggressive environment
Flexural Strength	300-450 psi [2070-3100 kPa]	ASTM C293
Compressive Strength	100-200 psi [690-1390 kPa] after 672 hours curing time	ASTM C109

Estimated Bags of GEM for Backfilling Around Ground Rods to a Density of 63.5 lb/ft ³ (1,017 kg/m³)
Diameter of Hole		ft	m	ft	m	ft	m	ft	m	ft	m	ft	m
Inches	Centimeters	5	1.5	6	1.8	8	2.4	10	3	15	4.6	20	6.1
4	10.2	2		2		2		3		4		5
6	15.2	3		3		4		5		8		10
8	20.3	5		6		8		9		14		18
10	25.4	7		9		12		14		21		28
12	30.5	10		12		16		20		30		40