Contrary to comment that, “Reply from: Bob Joslin
Neutral isolators are actually the "last resort" in abating this issue. Isolators do not "solve" the problems attributed to the utility side of the system, and do absolutely nothing for the consumer side of the facilities.” Is COMPLETELY WRONG. The Electric Power Research Institute (EPRI) states that they expect 60 percent of the phase current to flow back over the earth on the way back to the substation transformer. We have measured as high as 81 percent of the phase current flowing back over the earth. Of that 60 percent the neutral blocker will block approximately 50 percent or more. In many cases especially with swimming pools the reduction of the directly connected stray current from the primary neutral of the pole mounted, pad or underground transformer flowing through the pool is reduced. What stray current left to flow is only that stray current from the multiple electrical connections from the bastardized neutral to earth connection, which is made at least 4 times per mile.
Donald W. Zipse, P.E.
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