low voltage and high voltage
- Thread starter dominicp
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bdarnell
Senior Member
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Try Article 490 - Over 600 Volts
And, not to pick at nits, but 600 volts and 601 volts are both widely considered as "low" voltage. Low voltage is generally accepted as anything up to and including 2 kV. Article 328 defines medium voltage cable as a cable rated 2001 volts or higher, up to 35 kV. I agree that in our end of the business, the terms "low" and "high" voltage are generally applied to 230 volt and 480 volt systems, respectively.
And, not to pick at nits, but 600 volts and 601 volts are both widely considered as "low" voltage. Low voltage is generally accepted as anything up to and including 2 kV. Article 328 defines medium voltage cable as a cable rated 2001 volts or higher, up to 35 kV. I agree that in our end of the business, the terms "low" and "high" voltage are generally applied to 230 volt and 480 volt systems, respectively.
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zog
Senior Member
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IEEE definitions for equipment ratings:
Low voltage - 0-600V
Medium - 601V-69,000V
High - 69kV-230kV
Extra high - 230kV - 800kV
Ultra High - >800kV
Low voltage - 0-600V
Medium - 601V-69,000V
High - 69kV-230kV
Extra high - 230kV - 800kV
Ultra High - >800kV
In general, a lot of articles are divided into two parts - one for 600V and under, and the other for 600V and over.
For example, Article 110 that Celtic mentioned. Also see 460 Parts I and II, and 470 Parts I and II.
Who wants to page through and find all the articles that are divided into under 600V and over 600V?
Steve
For example, Article 110 that Celtic mentioned. Also see 460 Parts I and II, and 470 Parts I and II.
Who wants to page through and find all the articles that are divided into under 600V and over 600V?
Steve
kingpb
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steve66 said:In general, a lot of articles are divided into two parts - one for 600V and under, and the other for 600V and over.
For example, Article 110 that Celtic mentioned. Also see 460 Parts I and II, and 470 Parts I and II.
Who wants to page through and find all the articles that are divided into under 600V and over 600V?
Steve
I vote for Steve!
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The fact that the NEC often draws a line at 600 volts, in the development of rules for various applications, does not mean that the NEC is defining "low voltage" as being 600 or under. I would caution everyone to take care, when using the terms "low voltage," and "medium voltage," and "high voltage." You need to make sure the person with whom you are talking uses these terms in the same manner as you do. When you say, for example, "low voltage," you might be talking about a 120 volt circuit, and your listener might think you mean a 24 VDC security alarm circuit.
The fact that there are IEEE definitions related to these terms has no bearing on their common usage. Most "low voltage electricians," for example, are not going to care that the IEEE considers 120 volts to be "low." They are going to call 120 volts "high," no matter what the IEEE has to say about it.
I repeat, every time you use these terms, or at least the first time you use them with a person you have not worked with before, take a moment to state your intended meaning of the terms.
The fact that there are IEEE definitions related to these terms has no bearing on their common usage. Most "low voltage electricians," for example, are not going to care that the IEEE considers 120 volts to be "low." They are going to call 120 volts "high," no matter what the IEEE has to say about it.
I repeat, every time you use these terms, or at least the first time you use them with a person you have not worked with before, take a moment to state your intended meaning of the terms.
zog
Senior Member
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Right Charlie,
I get calls that go like this" Do you do high voltage training/service?"
To me that means a 69,000V - 230,000V system, if an industrial guy is calling he probally means 13.8kV or 4160V, if it is a contractor he might mean 120V. It is very important to clarify what you mean when you use those terms.
I get calls that go like this" Do you do high voltage training/service?"
To me that means a 69,000V - 230,000V system, if an industrial guy is calling he probally means 13.8kV or 4160V, if it is a contractor he might mean 120V. It is very important to clarify what you mean when you use those terms.
LarryFine
Master Electrician Electric Contractor Richmond VA
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steve66 said:That's the way politics should be. Everyone has to vote for somebody who doesn't want to be elected.
But that's not the way it is, so you can't vote for me because I'n not running
"If nominated, I will not run; if elected, I will not serve." ~ Pat Paulson
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Actually, that comes from the devil incarnate, or so the man is viewed by the southern half of this country (Did I ever mention that I grew up in Texas?). His name was William Tecumseh Sherman.LarryFine said:
LarryFine
Master Electrician Electric Contractor Richmond VA
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Aha. I guess I'm more interested in comedy than politics.charlie b said:
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