Parelle Conductors Over 600V (2400 volts)
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Re: Parelle Conductors Over 600V (2400 volts)
I think 310.4 applies to all voltages. It doesn't list any voltage limitations, so it applies to all voltages by default.
In general, (someone please correct me if I am wrong here) a NEC article deals with all voltages. Then at the end of the article, there may be additional requirements for higher voltages (i.e. above 600 volts). For example, 310.1 through 310.15 apply to all voltages, but some paragraphs may be modified or changed by 310.60. (Which happens to deal with over 2000 volts, but most others deal with over 600 volts).
Steve
I think 310.4 applies to all voltages. It doesn't list any voltage limitations, so it applies to all voltages by default.
In general, (someone please correct me if I am wrong here) a NEC article deals with all voltages. Then at the end of the article, there may be additional requirements for higher voltages (i.e. above 600 volts). For example, 310.1 through 310.15 apply to all voltages, but some paragraphs may be modified or changed by 310.60. (Which happens to deal with over 2000 volts, but most others deal with over 600 volts).
Steve
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Re: Parelle Conductors Over 600V (2400 volts)
I agree. Unless it gives a voltage limitation, it applies to all voltage levels.
I agree. Unless it gives a voltage limitation, it applies to all voltage levels.
Re: Parelle Conductors Over 600V (2400 volts)
Chapter 3 Wiring Mathods and Materials
300.2 Limitations A Voltage says that wiring methods specified in Chapter 3 is for 600 volt unless specified. Since 310.4 is part of Chapter 3
it seems to limit this requirement to 600 volt or less.
Just for information Yoopersup, why are you considering paralleling high voltage cable?
[ March 30, 2005, 05:12 PM: Message edited by: bob ]
Chapter 3 Wiring Mathods and Materials
300.2 Limitations A Voltage says that wiring methods specified in Chapter 3 is for 600 volt unless specified. Since 310.4 is part of Chapter 3
it seems to limit this requirement to 600 volt or less.
Just for information Yoopersup, why are you considering paralleling high voltage cable?
[ March 30, 2005, 05:12 PM: Message edited by: bob ]
Re: Parelle Conductors Over 600V (2400 volts)
Bob:
I don't quite agree. 300.2 says it applies to "wiring methods specified in Chapter 3". It does not say it applies to all of chapter 3.
I would consider a "wiring method" to be something like single conductors in RMC, or medium voltage cable, or any of the other raceway and/or cable types in Chapter 3.
I don't consider parallel conductors a "wiring method". Conductors in conduit would be a wiring method. And if we use a wire type in Article 310 that is rated 0-2000, I'd say paralleling is OK.
Steve
Bob:
I don't quite agree. 300.2 says it applies to "wiring methods specified in Chapter 3". It does not say it applies to all of chapter 3.
I would consider a "wiring method" to be something like single conductors in RMC, or medium voltage cable, or any of the other raceway and/or cable types in Chapter 3.
I don't consider parallel conductors a "wiring method". Conductors in conduit would be a wiring method. And if we use a wire type in Article 310 that is rated 0-2000, I'd say paralleling is OK.
Steve
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Re: Parelle Conductors Over 600V (2400 volts)
Conductors for "general wiring" are clearly within the Scope of Art 310 for voltage ratings up to 35kV. See Sections 310.1 and 310.60.
If they are a recognized conductor construction in another Chapter 3 Article, such as 328, then, in absence of a specific prohibition of use, they are included in 300.2 "specific permissions."
Conductors for "general wiring" are clearly within the Scope of Art 310 for voltage ratings up to 35kV. See Sections 310.1 and 310.60.
If they are a recognized conductor construction in another Chapter 3 Article, such as 328, then, in absence of a specific prohibition of use, they are included in 300.2 "specific permissions."
Re: Parelle Conductors Over 600V (2400 volts)
yooper - I understand that paralleling of medium voltage conductors is not uncommon. I've done it for 13.8KV secondary of 20MVA xfmr.
The principles of 310.4 apply. NEC is not a design manual.
I believe that bob was simply asking what was the application.
yooper - I understand that paralleling of medium voltage conductors is not uncommon. I've done it for 13.8KV secondary of 20MVA xfmr.
The principles of 310.4 apply. NEC is not a design manual.
I believe that bob was simply asking what was the application.
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