Pipe to soil {TAIL ~ potential measurements} are carried out between the reference electrode and a connection to the pipe using a wireless transmission system or using {HEAD ~ an electrical power grid} neutral or ground wire as the conductor between the pipe and the reference electrode 
Pipe to soil { TAIL ~ potential measurements } are carried out between the reference electrode and a connection to the pipe using a wireless transmission system or using { HEAD ~ an electrical power grid } neutral or ground wire as the conductor between the pipe and the reference electrode
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