Test Equipment

Tools and Testing

Grounding Design Software

Safe Engineering Services & Technologies ltd. (SES) offers the most complete grounding analysis software packages in the industry. J Williamson Engineering is a licensed owner of Multi-GroundZ+ software, which is part of the CDEGS family of software packages for modeling grounding systems.

For more information on SES, CDEGS or MultigroundZ+ visit the SES website: https://www.sestech.com/

J Williamson Engineering Inc

Grounding Test Equipment

J Williamson Engineering Inc. uses the AEMC Ground Tester model 6472 with model 6474 vectoral processing unit for soil resistivity & grounding impedance test. This test set includes Rogowski coil sensors to permit the distinct measurement of the ground impedance of a single electrode while it is still connected to a multi grounded system. For more information on the AEMC 6472/6474 test sets visit the AEMC website:


J Williamson Engineering Inc
J Williamson Engineering Inc

Integrity testing of electrical connections are carried out using the Safearth CS3 Continuity Test Set. These tests confirm that all metallic components are grounded and bonded with good electrical connections.

Substation Grounding Tests

Substation ground system testing may require specialized test equipment rather than the traditional portable grounding test sets. J Williamson has experience using the new Omicron test model CPC 100 Multifunctional Primary Test System with the CP CU1 coupling unit for Line and Ground Impedance measurement. The current injection is done at 40 and 80 hertz, followed by measurements of Step/Touch voltages. Step and Touch voltages are measured with the Omicron Frequency Selective Voltmeter CP AL1.

For more information on the Omicron test equipment visit website:


J Williamson Engineering Inc