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Old 03-22-2014, 11:14 AM   #1
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Default Electrical Insulators

Was wondering if there is a rule of thumb of knowing what voltage is on the power pole by counting the number of insulators. For example one insulator equals x amount of voltage, and four equals x amount. Thanks all.
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Old 03-22-2014, 11:16 AM   #2
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I remember hearing one insulator for every 10,000 volts. I don't know if it's true though
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Old 03-22-2014, 11:43 AM   #3
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Quote:
Originally Posted by ponyboy View Post
I remember hearing one insulator for every 10,000 volts. I don't know if it's true though
I always heard, one rib for each 10,000 volts.
Today, it's kind of hard to tell. Poco upped the voltage in the area from 4800 to 13.2KV and are using the same insulators.
This is rural area and on the main roads, when the power poles were replaced, some of the insulators look like they're rated for a lot higher voltage, but those poles are a continuation of the 13.2 KV lines.
They probably did it for increasing the voltage in the future.
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Old 03-22-2014, 03:02 PM   #4
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For clearance it is number of insulators +10'.
I would give this one 22' of clearance.
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Old 03-22-2014, 05:52 PM   #5
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I don't know of any hard and fast rule. I've heard both 10kV and 20kV per bell, but actually putting that in practice will often only get you within about 50kV of the nominal voltage.

For transmission systems I look at the overall insulator length and pole construction. I can usually ballpark it that way.
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