National Electrical Code Handbook by Brian McPartland

By Brian McPartland

The nationwide electric CodeВ® is an the world over authorised safeguard code for electric and gear wiring. It specifies the minimal provisions helpful for shielding humans and estate from dangers coming up from using electrical energy and electric apparatus. someone inquisitive about any section of has to be conscious of tips on how to use and practice the Code at the activity. It undergoes a rigorous assessment and revision strategy each three years by means of the nationwide fireplace security organization (NFPA). This booklet is a relied on source for knowing and making use of the CodeВ®.

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Circuits and equipment of any utility company are exempt from the rule of the NEC when the particular installation is part of the utility’s system for transmitting and distributing power to the utility’s customers—provided that such an installation is accessible only to the utility’s personnel and access is denied to others. Outdoor, fenced-in utility-controlled substations, transformer mat installations, utility pad-mount enclosures, and equipment isolated by elevation are typical utility areas to which the NEC does not apply.

Fig. 100-15. Building: Most areas have building codes to establish the requirements for buildings, and such codes should be used as a basis for deciding the use of the definition given in the National Electrical Code. The use of the term “fire walls” in this definition has resulted in differences of opinion among electrical inspectors and others. Since the definition of a fire wall may differ in each jurisdiction, the processing of an interpretation of a “fire wall” has been studiously avoided in the National Electrical Code because this is a function of building codes and not a responsibility of the National Electrical Code.

As indicated by the fine print note (FPN), the authority having jurisdiction (AHJ) is usually not the electrical inspector. That is, the electrical inspector is generally a representative or employee of a local building department, which is the actual AHJ. The field inspector is charged by the AHJ with performing the function of AHJ. This distinction is subtle but essentially means that there is a “higher” authority than the field inspector. Where a disagreement occurs, the issue can usually be brought to the commissioner of buildings, or some other authority, for further disposition.

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