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<blockquote data-quote="Mike Sokol" data-source="post: 63919" data-attributes="member: 1989">Re: Why An Open Neutral Kills 120V DevicesActually, if the pole transformer is one phase of a 3-phase Delta distro (very common) there isn&#039;t a neutral on the primary side of the transformer at all. The grounding rod at the pole would be for the topmost utility wire on the poles acting as the lighting safety. If the transformer primary is one phase of a 3-phase WYE distro, then the Neutral bus would exist, but not be tied across to the secondary side. Essentially the bond point of the ground rod, secondary neutral and safety ground bus in the service panel creates a local ground plane for your facility or residence.In my diagram I&#039;m showing one phase of a 3-phase WYE transformer primary with an earth-grounded neutral bus, but it just as easily have been one phase a 3-phase Delta primary as well. </blockquote>

[QUOTE="Mike Sokol, post: 63919, member: 1989"] Re: Why An Open Neutral Kills 120V Devices [COLOR=#222222][FONT=Times]Actually, if the pole transformer is one phase of a 3-phase Delta distro (very common) there isn't a neutral on the primary side of the transformer at all. The grounding rod at the pole would be for the topmost utility wire on the poles acting as the lighting safety. If the transformer primary is one phase of a 3-phase WYE distro, then the Neutral bus would exist, but not be tied across to the secondary side. Essentially the bond point of the ground rod, secondary neutral and safety ground bus in the service panel creates a local ground plane for your facility or residence. In my diagram I'm showing one phase of a 3-phase WYE transformer primary with an earth-grounded neutral bus, but it just as easily have been one phase a 3-phase Delta primary as well. [/FONT][/COLOR] [/QUOTE]

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