relying on a ground far away can cause some problems.. In a very rocky area, a local mall had a problem where the telephone and power came in for opposites sides and everytime you touch between the different equipment you would get shocked. Power company had to come in and place additional grounds in this long building to lower the potential. and bring its grounding system down to a safe level. With enough grounds, and bonding all the steel structure, the 30 to 60 volts was brought down to a safe level. Due to the rock, a lot of grounding by the building owner had to be done as well.
SO.. in your 3 wire system,, absolutely add a very good ground.. If metal building also ground the build well at multiple locations and tie to box ground. If 4 wire system, and long run, a major fault could see a ground rise potential..(like the case of North Star Mall) and may be enough to be deadly.. so a grounding system there is very important as well. wet working conditions, very good grounds and connections on all runs is important. The power company grounds the neutral at EVERY pole now to keep the neutral safe and always NEAR ground. or as near ground as possible in a fault or lightning hit situation. This is mandatory for the other utilities sharing the pole run as well, as their messenger strand must be tie to.. and at the same potential as the neutral.
all the same disclaimers, from a retired utility company engineer.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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