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 Applying the Code:
Q: 
Would equipment rated Class I Div. 1 A, B, C, or D be sufficient for use in Class II Div. 1 E, F, or G locations? We are an ammunition manufacturer, and there are times when we can’t find equipment rated Class II Div. 1 E, F, or G but we can easily find it in Class I Div. 1. Wouldn’t anything rated Class I Div. 1 be made to more stringent specifications, temperature ratings, etc. and therefore cover Class II uses?

Code Check:
True or False: An intrinsically safe circuit is one in which any spark is incapable of causing ignition in flammable or combustible material.


FastFact
In 1984, the first edition of Fischer’s Pocket Guide to the National Electrical Code was published by Prentice Hall.

 
Code Topic of the Month
 
Electrical Installations in Hazardous Locations
 
 

A CLOSER LOOK:
Electrical Installations in Hazardous Locations
Mark W. Earley

Some electrical installations—those within gasoline stations and chemical plants are common examples—present significant design challenges to keep them safe. Many of these installations would be considered hazardous locations, as covered in Articles 500 through 517 of the NEC®. The simplest hazard mitigation for such installations is to locate much of the electrical equipment outside of the hazardous location. However, even with this safety measure in place, it is important that the installation design not allow the hazard to be introduced into the safe parts of the facility.

Locating the Disconnecting Means for Services and Outside Branch Circuits and Feeders
Jeffrey Sargent

The "ready access" provision outlined in our previous discussion of disconnecting means for outdoor branch circuits and feeders is equally applicable when the equipment is located inside the building or structure supplied. In addition, there is another very important requirement applicable to indoor service disconnecting means, found in 230.70(A)(1).
 
 
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NFPA 70E 2009 Edition
NFPA 70E 2009 Edition with Changes Highlighted (pdf)
Around the Circuit
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2008 NEC® Essentials 3-Day Seminars [Details]
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Electrical System Aging

Research Project   

UL engineers Dave Dini and John Drengenberg introduce a new study on the effects of aging on a home’s wiring.

 

 

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