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Yes, they are required by the national electric code.
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.
The National Electrical Code is the recognised standard to which all electrical wiring and installations must adhere to. It is a requirement of selling a house that all wiring and equipment must feature this code to prove it has been correctly fitted.
The live wire is brown in coulor while the earth wireis green and yellow in color and neutral wire is blue in colour. Uses of these three wire: Live wire:It's connected with fuse.It carries a voltage which drives electric current through the electrical appliances. Earth wire:It is a safety device and protect us from electric shock. Neutral wire:It offers a return path by electric current.
It is a locked rotor kva code. See related link for an excellent description.
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The purpose of the National Electric Code (NEC) in America is to have a universal safe way of installing electrical wiring and equipment. It was first published in 1897.
The National Fire Protection Association
Yes, they are required by the national electric code.
role of national electric code in the design of electrical installation
National Electrical Code (NEC)
22 ft
The purpose of the NESC is to provide safety for the public from utility lines. It governs clearances and other items that could create hazards for the public or hamper public servants from performing their duties. Examples are clearances of electric lines from pools, or from earth to conductor heights or conductors in front or around windows. The distance poles are from fire hydrants is another example of an NESC violation and serves as an example of hampering someone from performing their duty. It should not be confused with the National Electrical Code (NEC) which is for house and premise wiring methods and is not followed by electric utilities.
Bob Norris has written: 'California journeyman electrician's preparation & study guide based on the 2002 National electrical code' -- subject(s): Electric wiring, Examinations, Insurance requirements, National Fire Protection Association, Safety measures, Standards, Study guides 'Journeyman electrician's preparation & study guide' -- subject(s): Safety measures, National Fire Protection Association, Study guides, Insurance requirements, Examinations, Electric wiring, Standards
In the USA, the National Electrical Code is NFPA 70. There are several national fire codes, including National Fire Code (also called Uniform Fire Code); NFPA 1 (National Fire Protection Association) and the International Fire Code (International Code Council). Each of these references hundreds of other codes and standards, including Life Safety Code, Building Code, Electrical Code, etc.
the vehicle code
Yes, Delaware has adopted the code. There may be some exceptions to parts of the code. Contact your local inspector for clarification on this.