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You've certainly received much good advice. The only item I want to emphasize is that soil resistivity is a very important aspect of grid design and should not be assumed. In more cases than not will you ever find a uniform soil, i.e. one layer. It's usually two or multilayers. The lower level...

One of the best resources for calculating ratings for bare overhead conductor, rigid circuilar bus, and rectangular bus are IEEE Standards 738-2006 and 605-1998. These standards provide heat balance equations that are easily used for rectangular bus. As was mentioned previously, there is...

pwrtran: I guess I did not address your underlying question. I don't know any company that can perform a high-current S&T potential measurement for this site in Ontario, or in North America. However, if you provide me details about the site and it's location I can specify the equipment and...

Cucky2000 is correct, but their is software and test equipment to model the human and footware aspect. I will be demonstrating a test equipment on behalf of Omicron Electronics in June on a Hydro Quebec facility. The nice aspect of this equipment is you can use a transmission line as the current...

Yes, I do. In fact my company OrionMagnetics, LLC is currently developing a software to thermal rate (current carrying capacity)equipment such as rigid circular bus, circuit breakers (medium and high voltage), bare overhead conductor, CT's, etc. http://www.orionst.com

I agree, Step and Touch Potential Measurements are becoming more common. It's really the only way of determining if a ground grid was installed according to design or to monitor the integrity of the grid over time. I have found that many firms and utilities cannot conduct step and touch...