Electical Contractor

| August 2010

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Codes & Standards

A large number of calculation provisions are in the National -Electrical Code (NEC). Knowing where to find those calculation provisions and how to perform them is essential to electricians, engineers, inspectors and others involved in the electrical industry.

Of Commerce and Industry

| August 2010

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Codes & Standards

Electrical Contractor readers requested an article explaining a simplified method for calculating a load for a commercial or industrial facility. Let’s arrange these loads in systematic order so that it is easier to derive a total load.

How Are They Used?

Cement Dust, Requirements for Transformer Installations and More

| July 2010

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Codes & Standards

This article, second in a series, addresses design letters and code letters and how they are used in motor-circuit design and installation. It highlights the different characteristics of letters and why it is sometimes desirable to choose one over the other.

Branch-Circuit, Feeder and Service Calculations, Part LIII

| July 2010

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Codes & Standards

If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to letthecodedecide@earthlink.com.

Branch-Circuit, Feeder and Service Calculations, Part LII

| July 2010

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Codes & Standards

Load calculation requirements are in Article 220 of the National Electrical Code (NEC). This article contains provisions for calculating branch-circuit, feeder and service loads.

| June 2010

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Codes & Standards

Last month’s Code in Focus concluded by covering optional feeder and service load calculation requirements for one-family dwellings in 220.82. This month, the discussion continues with optional feeder or service load calculations for existing dwelling units as specified in 220.83.

What’s the Story?

Dwelling Unit Receptacles, NEC Annex Explanations and More

| June 2010

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Codes & Standards

Often while instructing a workshop, I receive the question about how design letters and code letters are used when designing and installing motor circuits.

Cable Tray Under Raised Floors, Outdoor Space Wiring and More

| June 2010

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Codes & Standards

If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering if or why such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to letthecodedecide@earthlink.com.

Branch-Circuit, Feeder and Service Calculations, Part LI

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Codes & Standards

If you have a National Electrical Code (NEC)-related problem, are experiencing difficulty in understanding an NEC requirement, or are wondering why or if such a requirement exists, ask Charlie and he will let the Code decide. Send your questions to letthecodedecide@earthlink.net.

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Codes & Standards

Article 220 of the National Electrical Code (NEC) provides requirements for calculating branch-circuit, feeder and service loads. Article 220 is divided into five parts. Part I contains general requirements for calculation methods. Part II provides calculation methods for branch-circuit loads.

Get out of Here!

Mark C. Ode

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Codes & Standards

Recently, a question was raised about where the means of egress from a working space started and stopped based on changes that occurred in 110.26(C)(3) for 600-volt (V) or less installations and in 110.33(A)(3) for more than 600V installations in the 2008 National Electrical Code (NEC).

Men into Space

Multiple LFMC Issues, Back-Fed OCPDs and More

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Codes & Standards

I visited with a contractor friend’s engineer and electrician who were assigned to inspect a number of existing manholes on the property of a large industrial site.

Occupancy Limit: 2011

Mark C. Ode

| April 2010

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Codes & Standards

An increasing number of occupancy sensor switches, involving infrared sensing, are being installed in commercial, residential and industrial installations to cut power usage and comply with energy conservation codes.

| April 2010

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Codes & Standards

If you have a National Electrical Code (NEC)-related problem, are experiencing difficulty in understanding a Code requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Questions can be sent to letthecodedecide@earthlink.net.

Peacekeeper

Branch-Circuit, Feeder and Service Calculations, Part L

| April 2010

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Codes & Standards

The foreman for a group of electricians wiring an industrial facility sent me an e-mail asking a number of installation questions based on the National Electrical Code (NEC).

April 2010

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Codes & Standards

How many times has it been said that the National Electrical Code (NEC) is a minimum set of electrical standards or that the Code contains minimum electrical installation requirements?

Baseboard Heaters, Grounding With Rebar and More

Branch-Circuit, Feeder and Service Calculations, Part XLIX

| March 2010

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Codes & Standards

If you have a National Electrical Code (NEC)-related problem, are experiencing difficulty in understanding an NEC requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code decide. Send your questions to letthecodedecide@earthlink.net.