This article was posted 07/19/2012 and is most likely outdated.

Mike Holt - Integrating Electronic Equipment and Power into Rack Enclosures
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Integrating Electronic Equipment and Power into Rack Enclosures

Integrating Electronic Equipment and Power into Rack Enclosures
Optimized Power Distribution and Grounding for Audio, Video and Electronic Systems

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This paper was produced by Middle Atlantic Products and the following text is taken from the document's preface:

In providing this information, the intent is not to make audio/video system professionals into electricians. They do however need a basic understanding of proper design and installation of power distribution and grounding to avoid potential noise and safety problems.

In order to get a good understanding of how some potential power and grounding problems present themselves, basic knowledge of power distribution is required. It is the intent of this document to provide this information.

Every state, city and municipality in the United States is responsible for its own safety standard for electrical installations. While some choose not to adopt any standard, most adopt and enact the widely-accepted National Electrical Code (NEC) or a version of the NEC enhanced to reflect the needs of their respective jurisdictions. Each is at liberty to incorporate additional requirements or remove exceptions, as they see fit. The state of New Jersey, for example, replaced the term “authority having jurisdiction (AHJ)” with “electrical subcode official” before enacting the NEC standard. Always be sure to check the requirements of the local authority having jurisdiction. The information presented in this paper is based on the NEC as it is written. Some areas may have more rigid requirements; however, the NEC is generally the minimum requirement. The NEC is updated every three years. This document is based on the 2008 version.

The NEC is not intended to be used as a design specification or an instruction manual for untrained persons. Some experienced installers have problems adapting the NEC to specific installations. Much of the problem is due to the many exceptions to the rules. The fact is there are more exceptions than there are rules. In addition many rules refer to, and are superseded by, several other sections of the NEC. This document should help to clarify the intentions of the NEC as it relates to audio and video systems.

Please click here to review the rest of this document produced by Middle Atlantic Products.

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Comments

  • This is crazy. More government more regulations. I do solar power and run into the same issues, cretin areas of the country where the building departments have over stepped their bounds requiring things that only they know to do causing a failed inspection and a re inspect fee. This is a way government steals from the public, called a unman dated tax. Government just keeps getting bigger.

    perry vogler  July 21 2012, 8:20 am EDT
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  • Same issue - please foward a link, as the download does not work.

    In New Jersey, it is not always the "Electrical Subcode Official", for example - on Military Bases, it does indeed become "the authority having jurisdiction".

    Spencer Morasch  July 20 2012, 11:18 am EDT
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  • "A rose by any other name, would smell as sweet". The AHJ could be called Elect Sub-Code Official, Elect Inspector, Municipal Elect Engineer.....etc.

    It just depends on how the "LOCAL LAW" is written. The adopped law (thousands of pages) is determined by the local/state elected officials, along with engineers and lawers. There are many exceptions and ammendments. As an example: Hospitals in N.J. cannot be inspected by local elect sub-code official, they must be inspected by a "STATE" electrical inspector.

    Jim Herrick  July 20 2012, 11:05 am EDT
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  • It is my understanding that the AHJ in the code is not allways intended to be the same person or function. Often it is the local inspector, but in other cases it might be an engineering or other function. I cannot imagine all the issues that have arisen by the simple change New Jersey has made to substitute "electrical subcode official".

    Ken Lillemo  July 20 2012, 10:46 am EDT
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  • Mike, As a Speciality low-voltage contractor this info would be very helpful to me. Unfortunately I was unable to down-load this article. Please forward me the link so I could download this useful information.

    Thank you, Jack Freed Custom Cable jfreed@customcable.com

    Jack Freed  July 20 2012, 7:04 am EDT
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