Electical Contractor

Overcurrent Protection for Motor Circuits

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Codes & Standards

CODE CITATIONS Article 110—Requirements for Electrical Installations; Article 230—Services; Article 240—Overcurrent Protection; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers;

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Codes & Standards

There are many misconceptions in the field when dealing with motor circuits. Can the overcurrent protection device in the motor circuit be sized significantly larger than what is normally used to protect the circuit conductors?

Call Before You Dig !!!

Section 384 Uncertainties Cleared Up

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Codes & Standards

During the1999 National Electrical Code (NEC) cycle, Code-Making Panel 3 (CMP-3) accepted a revision to Section 300-5(d) that reads: “Service laterals that are not encased in concrete and that are buried 18 inches (457mm) or more below grade shall have their location identified by a warning ribbon t

Branch Circuits, Lampholders, Motor Controllers, and More

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Codes & Standards

Since it first appeared in the 1953 National Electrical Code (NEC) as Sec. 3881 until the 1999 edition in Sec.

Sizing an Equipment Grounding Conductor for a Tap

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Codes & Standards

CODE CITATIONS Article 210—Branch Circuits; Article 410—Lighting Fixtures, Lampholders, Lamps, Receptacles; Article 430—Motors, Motor Circuits, Controllers Motor branch circuit protection

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Codes & Standards

Tapping a smaller conductor from a larger conductor is common in many electrical installations. Article 240 provides information on the minimum size of tap conductors for installations based upon the overcurrent protection device’s size and location.

Designing by the Code

Derating Parallel Conductors

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Codes & Standards

In July’s Code Corner, we discussed the location of motor/controller disconnecting means as required by Section 430-102.

Article 370—Boxes, Conduit Bodies, and Fittings General Installation, Sections 370-17 through 370-19

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Codes & Standards

Few topics considered in NECA’s on-line “Code Question of the Day” have kindled more fiery disagreement than that of this month’s article.

Grounded Conductor ID, Outside Branch Circuits and Feeders, Services, Lighting Fixtures, and More

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Codes & Standards

370-1 Scope

Splices and Conductor Fill in Enclosures and Wireways

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Codes & Standards

CODE CITATIONS Article 200—Use and Indentification of Grounded Conductors; Article 225—Outside Branch Circuits and Feeders; Article 230—Services; Article 250—Grounding; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles;

NEC and OSHA Add to Confusion about GFCIs

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Codes & Standards

The conductor fill requirements for a conduit or an outlet box are calculated in the field on a regular basis.

Flexible Metal Conduit Length, Use of the Term ‘Tap’ Conductor for High-temp Wires

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Codes & Standards

Ground fault circuit interrupters (GFCIs) have been around since the early 60s, yet there is much confusion about their use and how they operate.

Overcurrent Protection for Motor Installations, Part II

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Codes & Standards

Since the 1940 National Electrical Code (NEC), there has been a requirement that recessed incandescent fixtures be connected by wire having insulation suitable for the temperature.

Article 370—Outlet, Device, Pull and Junction Boxes, Conduit Bodies and Fittings, Part III

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Codes & Standards

This month’s column will continue with questions and answers relating to overcurrent protection for conductors in motor and controller circuits and overload protection for motors.

Outlet, Device, Pull and Junction Boxes, Conduit Bodies, and Fittings: Article 370-Box Fill Calculations, Part II

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Codes & Standards

Box Fill Calculations, Part I, appearing in June’s issue, introduced box fill, with emphasis on Section 370-16(a). Notably, Table 370-16(a) is used to determine the maximum number of conductors (for sizes No. 18 through No. 6) permitted within common-size metal boxes.

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Codes & Standards

370-16(a) Box Volume Calculations

CODE Q &A

Defining Effective Grounding in Article 250

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Codes & Standards

CODE CITATIONS: Article 100-Definitions; Article 110-Requirements for Electrical Installations; Article 210-Branch Circuits; Article 220-Branch-Circuit, Feeder, and Service Calculations; Article 373-Cabinets, Cutout Boxes, and Meter Socket Enclosures; Article 400-Flexible Cords and Cables; Article 4

To Ground or Not to Ground-That Is the Question

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Codes & Standards

In the 1999 National Electrical Code (NEC), and particularly in Article 250, the words "effective" and "effectively" are frequently used in relation to grounding and bonding.