This article was posted 12/09/2005 and is most likely outdated.

Grounding vs Bonding Online Training
 

 
Grounding vs Bonding: 250.50 Grounding Electrode System

December 9, 2005 

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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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Grounding versus Bonding
PART III. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTOR  Hi Res - Cable/DSL [10980Kb]       Page 2 of 14
Sections

250.50 Grounding Electrode System.

All grounding electrodes as described in 250.52(A)(1) through (A)(6) that are present at each building or structure must be bonded together to form the grounding electrode (earthing) system. Figure 250–91
  • Underground metal water pipe [250.52(A)(1)]
  • Metal frame of the building or structure [250.52(A)(2)]
  • Concrete-encased steel [250.52(A)(3)]
  • Ground ring [250.52(A)(4)]
  • Ground rod [250.52(A)(5)]
  • Grounding plate [250.52(A)(6)]
Exception: Concrete-encased electrodes are not required for existing buildings or structures where the conductive steel reinforcing bars aren’t accessible without disturbing the concrete.

Where an underground metal water pipe electrode, metal building or structure frame electrode, or concrete-encased electrode is not present, one or more of the following electrodes specified in 250.52(A)(4) through (A)(7) must be installed to create the grounding electrode (earthing) system. Figure 250–92
  • Ground rod [250.52(A)(5)]
  • Grounding plate [250.52(A)(6)]
  • Metal underground systems [250.52(A)(7)]




Figure 250–91
(Click on image to enlarge)


Figure 250–92
(Click on image to enlarge)

     

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!

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