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What Article and Section of the National Electrical Code allows the use of a white wire as an ungrounded conductor?
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∙ 11y ago
Nfpa 70 2008 nec
200.7 (c) 2
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∙ 11y ago
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What is National Electric Code Article 250?
The national electrical code is a publication thet governs commercial, residential and industrial electrical installations. Article 250 is the section governing grounding and bonding installations.
How do you determine the ground wire size for a single phase 400 amp service?
I assume we are talking about 120/240V service somewhere in the US, and that you are using copper wire! You must consult the NEC (National Electric Code) or other code your municipality uses. It must be the year of issue that your municipality has adopted AS AMMENDED by that municipality. Many cities do not adopt the codes as-is, they change things here and there. Get a copy, or hire someone who knows this stuff. Using the plain 2005 NEC, I would go to article 230 - Services. It tells me the size of the grounded conductor depends on the size of the ungrounded service entrance conductors, so I have to know that first. 230.42A tells me the ungrounded conductors are sized according to 310.15, so I go to article 310, Conductors and look at table 310.15(B)(C). It says your 400 Amp service will use 400 kcmil wire for the ungrounded conductors. Back to article 230. Paragraph 230.42C says to size the grounded conductor according to 250.24C, so I turn over to article 250, Grounding. 250.24C sends me to table 250.66. Table 250.66 says that for service entrance conductors over 350 kcmil and less than 600 kcmil, the grounded conductor would be 1/0. There are a few exceptions and circumstances that could change the answer, but you get the idea. As you can see, this is not trivial, and mistakes will be costly. Hire a pro to do the calcs for you. Unless this is a homework or test question. In that case, you're welcome... If you're asking this question you shouldn't be installing an electrical service. Asking this type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code, or call a professional electrician. If someone were to give you an answer here, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any workANDalways use an electricians test meter having metal-tipped probes(not a simple proximity voltage indicator)to insure the circuit is, in fact, de-energized.
What consist of one or more sensing elements integral with the motor compressor and an external control device?
A Thermal Protector National Electrical Code, Article 100, Informational note
Is stacking of cables in cable tray permitted?
See NEC Article 392. It depends on the voltage, conductor size and the type of cable tray selected.
How many ground rods are needed for a 100 amp service?
If you're asking this, you shouldn't be installing an electrical service. --- This type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code and work this answer out for yourself, or call a professional electrician. If I were to give you an answer, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life.
What is National Electric Code Article 250?
The national electrical code is a publication thet governs commercial, residential and industrial electrical installations. Article 250 is the section governing grounding and bonding installations.
What is a conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes?
The conductor used to connect equipment or circuit to an earth electrode is earth bond or in some cases a supplementary bond. This will be generally carried out using a copper tape or an earth cable.
What section of the nec covers grounding?
Article 250 of the National Electrical Code covers grounding.
What is national electrical code 110.3?
NEC Article 110.3 is "Examination, Identification, Installation and Use of Equipment."
Where can you find the article regarding electrolytic cells in the NEC?
2008 National Electrical Code - Table of Contents - Chapter 6 Special Equipment - Article 668 Electrolytic Cells
Locked rotor current Where and how is it used sizing and specifying equipment for motor installation?
The specifics of this are found in Article 430 of the National Electrical Code.
How do electrical energy generated?
It is usually generated in a generator; read the Wikipedia article on "Generator" for more details. Briefly, this uses the physical principle that if a material is moved through a magnetic field, a voltage is generated. If such a material is a conductor, and appropriately connected, this voltage will cause an electrical current to flow.
Which Article of the Constitution addresses national supremacy?
Article VI of the U.S. Constitution addresses national supremacy.
What are 4 of the article of confederation?
Article IV - Relations Among the States Article V - Provisions for Amendment Article VI - National Debts, Supremacy of National Law, Oath Article VII - Ratification of Constitution
What consist of one or more sensing elements integral with the motor compressor and an external control device?
A Thermal Protector National Electrical Code, Article 100, Informational note
How do you determine the ground wire size for a single phase 400 amp service?
I assume we are talking about 120/240V service somewhere in the US, and that you are using copper wire! You must consult the NEC (National Electric Code) or other code your municipality uses. It must be the year of issue that your municipality has adopted AS AMMENDED by that municipality. Many cities do not adopt the codes as-is, they change things here and there. Get a copy, or hire someone who knows this stuff. Using the plain 2005 NEC, I would go to article 230 - Services. It tells me the size of the grounded conductor depends on the size of the ungrounded service entrance conductors, so I have to know that first. 230.42A tells me the ungrounded conductors are sized according to 310.15, so I go to article 310, Conductors and look at table 310.15(B)(C). It says your 400 Amp service will use 400 kcmil wire for the ungrounded conductors. Back to article 230. Paragraph 230.42C says to size the grounded conductor according to 250.24C, so I turn over to article 250, Grounding. 250.24C sends me to table 250.66. Table 250.66 says that for service entrance conductors over 350 kcmil and less than 600 kcmil, the grounded conductor would be 1/0. There are a few exceptions and circumstances that could change the answer, but you get the idea. As you can see, this is not trivial, and mistakes will be costly. Hire a pro to do the calcs for you. Unless this is a homework or test question. In that case, you're welcome... If you're asking this question you shouldn't be installing an electrical service. Asking this type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code, or call a professional electrician. If someone were to give you an answer here, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any workANDalways use an electricians test meter having metal-tipped probes(not a simple proximity voltage indicator)to insure the circuit is, in fact, de-energized.
The Framers created the national judiciary in what Article of the Constitution?
Article III
