Right or Wrong?


Here at Classes4contractors.com LLC we know that sometimes a picture is worth a thousand words. Our instructors don’t just lie around and watch their stories all day. They are hard working electrical contractors and inspectors. During their daily grind, they come across installations that are outstanding and some that are not so much. Tune into this area of our site for some educational and interesting photos and commentary. This is one section that is sure to remain interesting. Submit your own photos at contact@clasess4contractors.com for a chance to win a great prize in one of our monthly drawings.

Down to the Ground


Proper grounding of electrical systems is essential to the safety and performance. Article 250 of the 2014 National Electrical Code covers grounding and bonding requirements in great detail.



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Please Provide the Proper Identification


Residential electricians commonly use white insulated conductors inside of NM cable as ungrounded conductors. This month’s “Right or Wrong” covers the details on how to properly use white or gray conductors as “hots”.



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How Big Should that Bonding Jumper Be?


One of the most common code violations found in the field, by electrical inspectors, is improperly sized grounding or bonding conductors. This month’s “Right or Wrong” covers the proper sizing of bonding jumpers for ferrous metal raceways enclosing grounding electrode conductors.



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The Forgotten Fire Hazard


How bright should the lighting in a clothes closet be? The 2014 National Electrical Code does not mandate lighting levels for any occupancy. It does however specify where lighting is required and where it must be located. Although luminaires are not required to be located in clothes closest, the N.E.C. does specify which types of lighting fixtures are allowed in these areas and where they must be installed. This month’s article takes a look at lighting in clothes closets.



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Feeling Isolated and Ungrounded


How many code violations are illustrated in this picture? Although not a common installation, many electricians choose to use conduit fittings in improper applications. Conduit fittings and conduit bodies are designed to be used with specific wiring methods. In this article, we will take a closer look at what is wrong in this photo.



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Is that a Grounded Conductor?


Section 200.6(B) of the 2014 National Electrical Code allows the use of white tape for the identification of grounded conductors larger than 6 AWG. However, the code does not allow white tape for the support of junction boxes as shown in the picture above.



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The Misplaced Fuse


Section 240.22 of the National Electrical Code reads:No overcurrent device shall be connected in series with any conductor that is intentionally grounded, unless one of the following two conditions is met:
(1) The overcurrent device opens all conductors of the circuit, including the grounded conductor, and is designed so that no pole can operate independently.
(2) Where required by 430.36 or 430.37 for motor overload protection.



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