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NOTE: This is an unformatted excerpt from our online fire protection training library.

Introduction to the NEC

Arrangement of the Code

Chapters 5-7: Specific Requirements

Chapter 5 through 7 provide more detailed requirements that might modify the requirements in Chapters 1 through 4. In some cases, these requirements are simply more specific, while in other cases they are more restrictive or somewhat less restrictive.

Chapter 5 includes basic requirements for assembly occupancies where the primary issue is restricting the type of wiring method that can be used. Chapter 5 also deals with hazardous locations, providing very strict and specific requirements for preventing the electrical system from igniting a flammable atmosphere. Chapter 6 provides specific rules for special types of equipment, like welders, signs, cranes and fire pumps. In the case of fire pumps, for example, the rules are quite stringent and more restrictive in many ways than for other equipment. Article 630 on welders includes requirements that allow the use of overcurrent devices that are much larger than the size of the wire or the rating of the welder, but that are specific to that type of equipment. Chapter 7 deals with special conditions, such as emergency or standby systems with specific requirements regarding installation, permitted wiring and the coordination of overcurrent devices. Article 700 for emergency systems, for example, includes very stringent requirements – much more restrictive than the general requirements – that require complete separation of the emergency system from all other wiring. In Article 725 for remote control and signaling or Article 760 for fire alarm systems, wiring methods are permitted for some of these limited energy applications that are not suitable for any kind of power wiring.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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