First, the pipeline is not a grounding device. The grounding device must have a certain resistance to ground - only in this case it will perform its function. The pipeline, firstly, can have a large resistance relative to the ground and, accordingly, it will not discharge the dangerous potential to the ground. Secondly, there is a high probability that in some place an insert from a plastic pipe has been made - and, accordingly, the dangerous potential will not go into the ground. And in general, grounding serves to reduce the dangerous potential, that is, it does not completely exclude the dangerous potential. If a phase closes to the pipeline and shows a voltage of 220 V, then this is a deadly potential and the neighbors will be electrocuted.
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In more detail, I took an extension cord, I found a phase wire to it, I connected one end of the multimeter probe to the other end of the multimeter probe to the riser the result is in the region of 220 volts. consequently, the riser conducts currents and they, as I understand it, go away. but there is no potential and phase on the riser as you probably understood.
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Got it thanks. In case of an emergency at this time, a neighbor can shake it. By the way, I have an ouzo machine for everyone case. and I think to do the grounding so as not to pinch your hands when you touch the washing machine and bath. and my wife is so in general shakes.
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