National Electrical Code

 
OVERCURRENT PROTECTION FOR MOTOR INSTALLATIONS: PART ONE
June 2000
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This month's column concerns overcurrent protection for conductors in motor and controller circuits and overload protection for motors, subjects that many subscribers to our "Code Question of the Day" online feature have inquired about.

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Code Comments/Why Change a Good Thing?
June 2000
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Prior to and including the 1956 National Electrical Code (NEC) there was a limit of nine conductors in a raceway, except when used for control, stage lighting, elevators, and similar uses.

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Existing Rules Limit the Number of Conductors within a Box
June 2000
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Contrary to popular electrical opinion, designated rules limit the number of conductors allowed within outlet, device, and junction boxes. Unfortunately, all too often, electricians remove junction box covers only to find the box crammed full of conductors.

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Confusion with On-site Generators
May 2000
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Two similar installations have been proposed recently. The first is a proposed large hotel on a mountaintop at a distance of several miles from the nearest utility distribution line, and in a location subject to frequent lightning storms.

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Clarifying the Fuzziness Surrounding 'Qualified Person' Language Requires Careful Examination
May 2000
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"In industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons will service the installation..." Think about how many times the National Electrical Code (NEC) begins a requirement with these words.

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Temperature Limitations for Electrical Connections, Part II
May 2000
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110-14(c) Temperature Limitations

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Installation of Nonmetallic Sheathed Cable, Exposed or in a Raceway
May 2000
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Is it acceptable to install nonmetallic sheathed cable (NM) exposed on a wall or in an attic, a basement, or a residential garage? Where would physical protection of the NM cable be required, and where is physical protection of NM cable often used but not necessarily required?

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Properly Installing Nonmetallic Cable-Part II
May 2000
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The number and the content of "Code Question of the Day" submissions concerning the installation of nonmetallic sheathed cable suggests vast differences among, or lack of proper inspection of, electrical installations using Type NM cable as the wiring method.

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Branch Circuit, Feeder, and Service Calculations, Motors and Their Circuits and More
May 2000
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CODE CITATIONS: Article 110-Requirements for Electrical Installations; Article 210-Branch Circuits; Article 220-Branch Circuit, Feeder, and Service Calculations; Article 230-Services; Article 250-Grounding; Article 310--Conductors for General Wiring; Article 430-Motors, Motor Circuits, and Controlle

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Using a Two-Pole Breaker to Feed Split-Wired Receptacles with Break-off Tabs
by
Charlie Trout
| April 2000
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It seemed like a simple run-of-the-mill question when first presented. So, let's run it again. QUESTION: "If I split-wire a receptacle by breaking off the tab provided on the receptacle, do I have to use a two-pole breaker to feed this receptacle?" The answer is a qualified yes.

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Motor Starter Protection, Copper Conductor Ampacity, and more
March 2000
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CODE CITATIONS: Article 100-Definitions Article 210-Branch Circuits; Article 240-Overcurrent Protection; Article 250-Grounding; Article 310-Conductors for General Wiring; and Article 700-Emergency Systems Type "2" Motor Starter Protection

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Conduit Fill and Amapacity Calculations for Low-voltage Systems
March 2000
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Where installing Class 2 or Class 3 remote control, signaling, or power limited circuits in a raceway or where installing power-limited fire alarm circuits in a raceway, is it necessary to figure conduit fill?

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Up in the Air Over Mounting Transformers
March 2000
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A proposed location for a 112-kVa 480Y/277 dry transformer suspended above the working space for a switchboard raises several questions.

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Installing Lights in Clothes Closets
March 2000
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One of the most confusing aspects of residential wiring is installing lighting fixtures in clothes closets. Therefore, the National Electrical Code (NEC) devotes one of its relatively few diagrams (Figure 410-8) to the subject of where lighting fixtures can be located in clothes closets.

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Requirements for Electrical Installations
March 2000
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110-26 Spaces Surrounding Electrical Equipment

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Dedicated Space
February 2000
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Relocating the requirements for dedicated space below and above switchboards, panelboards, and motor control centers from Sec. 384-4 to Sec. 110-26 (110-16 in the '96 NEC logically combines these requirements with their related working space.

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Code Questions and Answers
February 2000
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Code Citations Article 225-Outside Branch Circuits and Feeders; Article 240-Overcurrent Protection; Article 250-Grounding; Article 400-Flexible Cords and Cables; Article 430-Motors, Motor Circuits, and Controllers; Article 445-Generators; Article 450-Transformers and Transformer Vaults.

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CODE QUESTION OF THE MONTH
February 2000
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With this issue of Electrical Contractor, we're pleased to introduce a new monthly column.

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Separating Voice/data from Power Conductors
February 2000
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The National Electrical Code (NEC), Class 2 and Class 3 covers remote-control, signaling, and power-limited circuits covered by Chapter 7 in Article 725. They are considered to be a special condition other than a normal power circuit.

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Wiring Fluorescent Fixtures, Equipment Grounding Conductors, and Service
January 2000
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CODE CITATIONS: Article 225-Outside Branch Circuits and Feeders; Article 230-Services; Article 250-Grounding; Article 400-Flexible Cords and Cables; Article 410-Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 422-Appliances. Wiring Fluorescent Fixtures

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