Why separate grounds and neutrals

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When should the ground and neutral wires be separated at a subpanel? It depends. Pre Up until the version of the National Electric Code, there were two ways to wire a subpanel. Newer Post Home inspection fail files: bathtub flood. More from Star Tribune. If you have not already, check out our other electrical articles like this one on cloth wiring. Save my name, email, and website in this browser for the next time I comment.

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Skip to primary navigation Skip to main content Reuben Saltzman July 16, Subpanels: when the grounds and neutrals should be separated. AND no safety ground exists to protect human and trip circuit breaker. We want neutral wire separated from safety ground so that any neutral wire break always leaves appliance still connected directly to breaker box safety ground and not connected to a neutral wire that is no longer connected to breaker box.

Just another reason why those two wires always remain separate. Home has its own single point safety ground inside breaker box. Power wires connect that system to another system that has its own single point ground - pole transformer. Pole transformer connects primary high voltage ground, secondary neutral, and earth ground to a common point.

Lightning strike to primary high voltage wire simply gets conducted safely to earth at transformer which is but one reason why that primary wire can be highest on pole.

Meanwhile, household single point ground in breaker box is one ground system centered at a single point. Transformer has its own single point ground system. How far apart are those two grounds? As current increases on neutral wire transformer to house , then both grounds become electrically more separated. Again, using a perspective of electrical distance to explain a concept.

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