Reply from: Yakov Shmayevich
To all theoretical and practical electrical engineers,
What I sent to Mike Holt’s Forum is a very important question that needs to be answered immediately. Anyone who touches the metal street light pole or traffic pole with stray voltage will get an electric shock. This problem needs to be solved. Remember, all people in the United States including electrical engineers are waiting for an answer.
Existing lamppost has no grounding rod, but has four anchor rods encased in cement. Adding a grounding rod is not possible in New York City because of all the underground infrastructure. If it was possible though, doesn’t this just add a second potential?
Would isolation transformer help if neutral was not connected to pole in any way? 88% of the stray voltage poles are from failed and unbalanced neutrals. If not how is this application different from the use in hospital or staging application of isolation transformers?
You haven’t given an answer to my question. Your answer is not clear and to the point.
My Question
Your Answer
My Comments
A.
Stray voltage
What do you mean stray voltage?
Stray voltage on metal street light pole or traffic pole
1.
Grounding and bonding
Follow the Code
Not a practical answer
2.
Isolation transformer, it doesn’t help, why?
Isolation transformer won’t solve an energized pole hazard
You didn’t provide the answer “why” (see attached drawing)
3.
Bracket with luminaire on wood pole should be grounded
You didn’t answer
See attached drawing
B.
Size of fuse for street light luminaire(s)
Fuse are optional (recommended)
Not a practical answer
C.
Size of wire for street light luminaire(s)
100-watt luminaire, 150-watt luminaire, 250-watt luminaire (120-volt); Not a practical answer
What I need is a concrete answer! Please don’t inform me to search the rest of the Internet for answer.
Yakov Shmayevich
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