Grounding vs Bonding Online Training 10

Many of you have completed our Online Continuing Education Courses which include video instruction and know this is a very fast way to obtain your CEU credits from the comfort of the chair you're sitting in. For the rest of you we are sending a weekly series of newsletters featuring an instructional page complete with videos.

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2002 Changes to the NEC^®

PART I

Page 11 of 13

Sections

250.8 Termination of Grounding and Bonding Conductors

The termination of equipment grounding and bonding conductors must be by exothermic welding, listed pressure connectors of the set screw or compression type, listed clamps, or other listed fittings. Sheet-metal screws cannot be used to connect grounding (earthing) or bonding conductors or connection devices to enclosures. Figure 250–42

Author’s Comment: The rule still doesn’t prohibit drywall screws or wood screws from being used for this purpose, just “sheet-metal” screws!

Figure 250–42
Click on Image to Enlarge

04. Grounding versus Bonding Library - DVDs

Grounding and bonding problems are at epidemic levels. Surveys repeatedly show a high percentage of power quality problems are due to poor grounding and bonding. Electrical theory has been applied to this difficult to understand Article, making it easier for students to grasp the concepts of grounding and bonding. Additionally, Mike has color coded the graphics so you can easily differentiate between grounding and bonding. For a limited time, you can order the Entire Grounding versus Bonding Library including the textbook, 2 videos, MP3 Audio CD and the Online Program for this great price. You save over $200!

Product Code: 05GBDVD
ISBN: N/A
MultiMedia: Tape & CDROM & DVD

DVD/CD Return Policy: Unopened sealed DVD's or CD's may be returned within 10 days and we will credit your credit card or issue a refund for the price of the item(s). Opened items may not be returned unless they arrive defective.

Table of Contents

Sample Pages

Sample Graphic

Comments

we live in the turk& coicos island we use a main discernnect at are meter service entrance and one at the main distrubation panel

walter stubbs
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That doesn't make much sense. Sheet-metal screws would hold much better than the other two mentioned in the author's comment. "Author’s Comment: The rule still doesn’t prohibit drywall screws or wood screws from being used for this purpose, just “sheet-metal” screws!"

The word "listed" says it all.

"insurance policies sometimes have clauses in them that will limit their liability in case of a claim made in response to the failure of a non-UL-listed device."

http://www.faqs.org/faqs/electrical-wiring/part1/

Interesting point!

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Mike, I was a little concerned about the statement that drywall or wood screws are ok to use. They usually have a beveled head and are not threaded all the way to the head of screw. I would be very skeptical and wary of this connection and would turn down a ground attached with either wood or drywall screws for attaching the ground as shown. Thank you

Steve Thomas
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Dear Sir,

I would like to know in articule 250, which rule deal with the bonding of different grounding electrodes from services like: electricity, communication, antena, lightning, etc. More specificaly lightning electrode shall be bounded or isolated from others grounding electrodes? Thanks Eng. Carlos Haug

Carlos Haug
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