Many equipment vendors and telecommunications companies now require ground systems at 5 Ohms resistance to ground

According to the IEEE Standard 142-1991 (The Green Book), the grounding electrode resistance of large electrical substations should be 1 Ohm or less. For commercial and industrial substations including telecommunications sites the recommended resistance to ground is 5 Ohms or less. This low resistance is required due to the high potential to earth of the electrical system. Depending upon the site location and soil characteristics, achieving that 5 ohm resistance can be very difficult. With proper soil resistivity testing however, we can provide grounding solutions that will achive 5 ohm resistance to ground and meet the stringent requirements such as the Motorola R56 standard to keep your valuable equipment within warranty.

- Click here to learn more about Soil Resistivity Test -

The most reliable soil resistivity test is the Wenner 4 point soil resistivity test

• The Wenner 4-point soil resistivity test uses 4 probes spaced at equal distances across the surface of the earth in a straight line.
• The distance that the probes are spaced determines the testing depth into the soil.
• Multiple tests are typically conducted at a variety of probe spacing.
• Data is then be entered into our specialized computer software and specific soil resistivity readings at various depths can be calculated.

Safe and cost effective electrical grounding design

The experts at E&S Grounding Solutions, utilizing the Wenner 4-point Soil Resistivity Testing Method, accurately model the electrical resistance characteristics of the soil at your site including ground potential rise. Our electrical grounding experts know where and how to conduct the tests so that the minimum amount of electrical interference will not affect the test results at your site. With the correct Soil Resistivity information, we now have the essential information needed to build a safe and cost-effective electrical grounding design.