Electical Contractor

Improperly Sized Conduit Bodies Can Lead to Conductor Damage

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Codes & Standards

CODE CITATIONS Article 250—Grounding; Article 310—Conductors for General Wiring; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 501—Class I Locations; and Article 680—Swimming Pools, Fountains, and Similar Installations Grounding electrode connections

Enforcing and Administering the NEC

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Codes & Standards

The requirements for the construction and installation of conduit bodies are mixed with those for boxes and fittings in Article 370 of the National Electrical Code (NEC).

Surpassing Standard Overload Protection

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Codes & Standards

The National Electrical Code (NEC) enjoys the reputation of being the most widely accepted standard in the world. The document is intended to provide for the practical safeguarding of persons and property from hazards associated with electrical installations.

Equipotential Plane and Voltage Gradients in Agricultural Settings and Raised Floors in IT Rooms

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Codes & Standards

"What is the full load current of that motor over there?” “Which current rating do you want? Each motor has three current ratings: nameplate, NEC Table, and locked rotor.”

Article 370-Boxes, Conduit Bodies and Fittings

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Codes & Standards

This month’s column addresses two rather different, recurring subjects on Electrical Contractor magazine’s “Online Code Question of the Day.” QUESTION: When building a barn for horses, I was required to establish an equipotential ground plane at the entrance, from the concrete floor of the barn to t

Article 370—Boxes, Conduit Bodies, and Fittings

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Codes & Standards

An enclosure that contains a device(s), or supports a fixture(s) or other equipment can be supported by the entering raceways when all of the following conditions are met: 1) the enclosure does not exceed 100 cubic inches in size; 2) the enclosure has threaded entries or hubs identified for the purp

Branch Circuits, Feeders, Service Calculations, Motors, Motor Circuits, Controllers, and More

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Codes & Standards

370-23(d)(2) Enclosures Fastened to Support Wires

Outside Branch Circuits or Feeders—Is a Separate Disconnect Required?

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Codes & Standards

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuits, Feeder, and Service Calculations; Article 225—Outside Branch Circuits and Feeders;

The Assured Equipment Grounding Conductor Program

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Codes & Standards

In the 1996 National Electrical Code (NEC), Section 225-8, the requirements for installing a separate disconnecting means for a branch circuit or feeder to a separate building or structure on the same property were fairly simple.

Noteworthy Code Changes Concern Branch Circuits

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Codes & Standards

In keeping with the stated purpose of the National Electrical Code (NEC), the “practical safeguarding of persons and property…” protecting workers from electrical shock while using temporary power is of great concern for all electrical contractors.

Branch Circuits, Grounding, Flexible Metal Conduit, Motors, and Transformers

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Codes & Standards

Several changes in the 1999 National Electrical Code (NEC) in Article 210, Branch Circuits, are worthy of comment.

Installing Electrical Equipment in a Combustible Dust Location

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Codes & Standards

CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuit, Feeder, and Service Calculations; Article 250—Grounding; Article 350—Flexible Metal Conduit; Article 410—Lighting Fixtures, Lampholders, Lamps, and Receptacles; Article 430—Motors, Motor Circuits, and Controllers; and

Safe Working Spaces around Electrical Equipment Allow Hasty Retreat

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Codes & Standards

Article 502 in the National Electrical Code (NEC) covers the installation of electrical equipment in a combustible dust location.

Is It Worth Removing the Exceptions?

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Codes & Standards

Over the past few months, we have discussed how good electrical design practice cannot and should not ignore the safety implications associated with the electrical installation.

Article 370-Outlet, Device, Pull and Junction Boxes, Conduit Bodies, and Fittings

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Codes & Standards

Herewith, various 1999 National Electrical Code (NEC) issues that do not warrant a whole page of discussion. This is an example of why it is wrong to follow a “remove exceptions” edict without first examining the consequences. The 1996 NEC, Section 410-12 reads as follows: