Grounding vs Bonding Online Training 11

This article was posted 11/30/-0001 and is most likely outdated.

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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Below is the full course page which includes these videos:

2002 Changes to the NEC^®

PART II

Page 1 of 13

Sections

250.20 Systems Required to be Grounded and Bonded

Alternating-current systems (power supplies) must be grounded and bonded as provided in (A), (B), (C), or (D).

Author’s Comment: System grounding, the intentional bonding of the electrical supply source to the metal case, provides the low-impedance fault-current path necessary to clear a ground fault. Figure 250–43

(A) Alternating-Current Systems Below 50V. Alternating-current systems operating below 50V aren’t required to have the system bonded to the metal case unless: Figure 250–44

(1)The primary is supplied from a 277V or 480V circuit.

(2)The primary is supplied from an ungrounded power supply.

(3)Where installed as overhead conductors outside of buildings.

(B) Alternating-Current Systems Over 50V. Alternating-current systems over 50V that require a grounded neutral conductor must have the grounded neutral terminal [250.26] of the power supply bonded to the system metal parts in accordance with 250.30(A)(1). Such systems include: Figure 250–45

2- or 3-wire, single-phase 120V or 120/240V systems
4-wire, three-phase wye-connected 120/208V or 277/480V systems
4-wire, three-phase delta-connected 120/240V
systems

Figure 250–43
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Figure 250–44
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Figure 250–45
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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

Mike! could you e-mail me some illustrations on primary voltages to transformer, I need to see the hook-up. I need to see from 2160 to 3 phaze delta and wye hook-up. I also need to see calculations on how many motors to put on a service ETC.

Thanks for the information

Floyd Mack of Wamba Remodeling Electrical Contractor.

Floyd H. Mack

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