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Some 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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[ Challenge Yourself - Take Our FREE Grounding vs. Bonding Exam ]

Grounding versus Bonding — 2005 NEC®
PART I   Hi Res - Cable/DSL        Page 3 of 13


250.2 Definitions Continued

Ground (Earth) [100]. Earth or a conductive body that is connected to earth. Figure 250–6

Grounded [100]. Connected to earth.

Ground Fault [100]. An unintentional connection between an ungrounded conductor and metal parts of enclosures, raceways, or equipment. Figure 250–7

Ground-Fault Current Path [250.2]. An electrically conductive path from a ground fault to the electrical supply source.

Author’s Comment: The fault-current path of a ground fault is not to the earth! It’s to the electrical supply source, typically the X0 terminal of a transformer.

FPN: The ground-fault current path could be metal raceways, cable sheaths, electrical equipment, or other electrically conductive materials, such as metallic water or gas piping, steel-framing members, metal ducting, reinforcing steel, or the shields of communications cables. Figure 250–8

Author’s Comment: The difference between an “effective ground-fault current path” and “ fault-current path” is that the effective ground-fault current path is “intentionally” constructed to provide the low-impedance fault-current path to the electrical supply source for the purpose of clearing the ground fault. A ground-fault current path is simply all of the available conductive paths over which fault current flows on its return to the electrical supply source during a ground fault.

Grounded (Earthed) [100]. Connected to earth.

Grounded Neutral Conductor [100]. The conductor that terminates to the terminal that is intentionally grounded to the earth. Figure 250–9

Grounding (Earthing) Conductor [100]. The conductor that connects equipment to the earth via a grounding electrode.

Author’s Comment: An example would be the conductor used to connect equipment to a supplementary grounding electrode [250.56]. Figure 250–10

Figure 250–6
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Figure 250–7
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Figure 250–8
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Figure 250–9
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Figure 250–10
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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
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.

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