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2005 NEC Changes Summary Articles 600 through 640

Chapter 6 Special Equipment

Chapter 6, which covers special equipment, is the second of four chapters that deal with special topics. Chapters 5, 7 and 8 deal with special occupancies, special conditions, and communications systems, respectively. Remember, the first four Chapters of the NEC are sequential and form a foundation for each of the subsequent four Chapters.

What exactly is "special equipment?" It's equipment that, by nature of its use, construction, or unique nature creates a need for additional measures to ensure the "safeguarding of people and property" mission of the NEC put forth in Article 90.

It's important to remember that Chapter 6 covers only the minimum safety requirements for the special equipment it covers and that, in most cases, other standards also apply. The NEC isn't meant as a substitute for those other standards. So before you begin work on any of this special equipment, first obtain the standards written for that equipment. If you're not sure what standards apply, contact the manufacturer for assistance.

ARTICLE 604 Manufactured Wiring Systems

Article 604 applies to field-installed manufactured wiring systems, while Article 605 applies to relocatable partitions. In both cases, you're installing and/or assembling pre-wired components or subassemblies. These normally come with manufacturer's instructions, so Code compliance is almost automatic if you follow the instructions. However, you still need to:

  • Compare the instructions against the provisions of Article 604 or Article 605, as appropriate.
  • Use the proper connection cords.
  • Apply the correct branch-circuit protection.
  • Apply proper mechanical support to the electrical components, cords, and connectors.

The specific requirements contained in this article aren't difficult to understand, but you should be familiar with them before installing manufactured wiring systems or wired partitions.

  • The title and text of this section were changed to require manufactured wiring systems to be secured, as well as supported, in accordance with the specific wiring method article.
  • New subsection clarifies that manufactured wiring systems of the flexible cord type can be used for electric-discharge luminaires, when installed in accordance with 410.30(C).

ARTICLE 605 Office Furnishings (Wired Partitions)

Article 604 applies to field-installed manufactured wiring systems, while Article 605 applies to relocatable partitions. In both cases, you're installing and/or assembling pre-wired components or subassemblies. These normally come with the manufacturer's instructions, so Code compliance is almost automatic if you follow the instructions. However, you still need to:

  • Compare the instructions against the provisions of Article 604 or Article 605, as appropriate.
  • Use the proper connection cords.
  • Apply the correct branch-circuit protection.
  • Apply proper mechanical support to the electrical components, cords, and connectors.

The specific requirements contained in this article aren't difficult to understand, but you should be familiar with them before installing manufactured wiring systems or wired partitions.

  • New rule requires a simultaneous disconnection means for multiwire branch circuits supplying fixed-type office furnishing partitions. Two- or three-pole circuit breakers, or single-pole circuit breakers with handle ties, can be use to comply with this requirement.
  • New rule requires a simultaneous disconnection means for multiwire branch circuits supplying freestanding-type office furnishing partitions. Two- or three-pole circuit breakers, or single-pole circuit breakers with handle ties, can be use to comply with this requirement.

ARTICLE 625 Electric Vehicle Charging System

Two particular goals dominate Article 625:

Avoidance of inadvertent connections or disconnections. Vehicle charging connectors must be configured so that they are not interchangeable with other electrical systems. They must prevent inadvertent contact of live parts with people. They must prevent unintentional disconnection. In fact, Article 625 requires automatic de-energization of charging cables under certain conditions. And, as you might expect, the grounding pole (if provided) must be the first to make and the last to break contact.

Provision of adequate ventilation. Batteries are chemical reaction chambers. As the chemicals in battery cells react, they release gases, such as hydrogen. Different types of batteries release different amounts of gas and some do not release much at all. But the types of batteries required for electric vehicles release relatively high amounts of gas. Thus, Article 625 devotes extensive space to ventilation requirements. Even when a charging station is outdoors, Article 625 provides height requirements to prevent ignition of battery gases. If you keep these two goals in mind, you will better understand Article 625 requirements. Article 625 accomplishes other goals as well, but these two are responsible for the bulk of the text.

  • Electric Vehicle. New text clarifies that "neighborhood electric vehicle," is a new category of electric vehicle that falls under the classification of an "electric vehicle."
  • New section contains the requirements for hybrid electric vehicles that have the capability to be used as a standby power source, in addition to its function of charging the vehicle batteries.

ARTICLE 640 Audio Signal Processing, Amplification, and Reproduction Equipment

If you understand three major goals of Article 640, you will better be able to understand and apply the requirements. These three goals are:

  • Reduce the spread of fire and smoke. For example, 640.3(A) requires removal of abandoned audio cables, and 640.3(B) requires the installation to conform to the duct and plenum requirements in 300.22.
  • Comply with other articles.
  • Prevent shock. Article 640 includes several requirements, such as specifics in the mechanical execution of work and requirements when audio equipment is located near bodies of water, to reduce shock hazards peculiar to audio equipment installations.

In addition, Article 640 distinguishes between permanent and temporary audio installations. Part II provides requirements for permanent installations, and Part III provides requirements for temporary installations.

  • Text revised to clarify that the accessible portion of abandoned audio distribution cable must be removed.
  • Text revised to clarify that audio cables must be secured as well as supported. And New FPN provides an informational reference to a comprehensive standard on neat and workmanlike manner.

Mike Holt's Comment: If you desire more information about any of the above changes, be sure to order my Changes book and/or library (Video/DVD).

12a. NEC Code Changes Textbook
Mike Holt’s Illustrated Changes to the NEC 2005 textbook is here! So, get ready now!

A new Code cycle has begun and it’s that time again to adapt to the 2005 NEC. Don’t let the scale of this change intimidate you. With Mike Holt’s Illustrated Changes to the NEC 2005, you’ll be up-to-speed in no time. Nearly 5,000 changes were proposed for the 2005 NEC! Over 225 of them will have a significant impact on designing, installing and inspecting electrical systems. Mike takes you through these changes, which he considers to be of critical importance. You’ll be able to easily gauge how these changes will impact your work and apply them instantly. This 120-page comprehensive full-color textbook includes 198 color illustrations for reference. Subjects include: General Requirements, Circuits and Protection, Grounding versus Bonding, Wiring Methods, Equipment for General Use, Special Occupancies, Special Equipment, Special Conditions, and Limited Energy and Communications Systems.

Why does Mike’s book give you an edge? It’s because of the extra effort put forth to organize these changes in an easy-to-follow manner. Each change includes:

  • Cross references to other related Code requirements to help you develop a better understanding of how the Code rules relate to one another.
  • Background information for each change along with explanations, which are delivered in Mike’s trademark style… easy-to-understand.
  • Author’s Comments – this is basically Mike speaking to you directly about something that he feels should be brought to your attention.
  • Full-color detailed graphics to reinforce those difficult concepts and provide instant understanding.

Product Code: 05BK
ISBN: 1-932685-27-8
Pages: 120
Illustrations: 198

Table of Contents
Sample Pages
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