What is Article 110 in the NEC?

Article 110 of the National Electrical Code (NEC) covers the general requirements for the examination and approval, installation and use, access to, and spaces about electrical equipment. The authority having jurisdiction (AHJ) must approve all electrical conductors and equipment [Sec. 110.2].

What is Article 100 in the NEC?

Article 100 defines a Grounded Conductor as – A system or circuit conductor that is intentionally grounded. This definition is undoubtedly correct, but as previously stated, a Grounding Conductor (aka Equipment Grounding Conductor) is ALSO grounded.

Does a disconnect have to be lockable?

There are sections throughout the Code that state the disconnecting means is required to be lockable in the open position. This simply means when the disconnecting means is in the open (or off) position, a lock can be installed to keep the disconnecting means from being closed (or energized).

What is dedicated working space above electrical equipment?

(a) Dedicated Electrical Space. The space equal to the width and depth of the equipment and extending from the floor to a height of 1.8 m (6 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation.

What is the NEC requirement of installing wiring devices?

The NEC requires that conductors of a circuit must be inside a raceway, cable, trench, cord, or cable tray. Additional protection such as NM cable inside raceway is needed if the installation method is subjected to physical damage as determined by the authority having jurisdiction.

What does Article 100 refer to?

Article 100 is the keeper of national electrical code definitions. The NEC Style Manual indicates that if a word or term is used in more than two articles, then it should have a definition in Article 100. A definition located here usually means the word or term is defined for use in that article.

How does a definition become listed in Article 100?

In general, only those terms that are used in two or more articles are defined in Article 100. Other definitions are included in the article in which they are used but may be referenced in Article 100.

Is it legal to lock a disconnect in the on position?

Response: There is no provision in the OSHA regulations that prohibits locking the disconnecting means in the closed (on) position. OSHA requirements are set by statute, standards, and regulations.

What is a lockable disconnect?

Where a disconnecting means is required to be lockable open elsewhere in this Code, it shall be capable of being locked in the open position. The provisions for locking shall remain in place with or without the lock installed.

How far above electrical equipment does the dedicated space extend?

What do you need to know about NEC Article 110?

National Electrical Code (NEC) Article 110 covers general requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations.

What is article 110.13 of the Electrical Code?

110.13. Mounting and Cooling of Equipment. This requirement is always in dispute, it seems. Cramming equipment into an overcrowded arrangement to maximize revenue per square foot sounds like a really good idea until that equipment starts failing left and right, or the whole place just burns down.

What are the requirements for 110.30 through 110.41?

The last sentence in 110.30 states requirements in 110.30 through 110.41 do not apply to equipment on the service point supply side. As defined in Article 100, the service point is the point of connection between the facilities of the serving utility and the premises wiring.

What’s the purpose of the National Electrical Code?

The purpose for the National Electrical Codeis to provide a safe installation, but Article 110 is perhaps focused a little more on providing an installation that’s safe for the installer and mainte‑ nance electrician, so time spent in this article is time well spent. REQUIREMENTS FOR ELECTRICAL INSTALLATIONS