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"Grounding: down to earth comments!" RARS Meeting – August 2009.

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Presentation on theme: ""Grounding: down to earth comments!" RARS Meeting – August 2009."— Presentation transcript:

1 "Grounding: down to earth comments!" RARS Meeting – August 2009

2 Reasons for Grounding Safety Performance

3 Safety Minimize touch potential. Provide a low impedance path to clear phase to ground electrical power circuit faults.

4 Performance Equalize potential differences to prevent or mitigate unwanted coupling, instability, radiation, etc.

5 Reasons for Grounding a Radio Station Minimize touch potential.

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7 Reasons for Grounding a Radio Station Minimize touch potential. Equalize potential differences to prevent or mitigate unwanted coupling, instability, radiation, etc.

8 Reasons for Grounding a Radio Station Minimize touch potential. Equalize potential differences to prevent or mitigate unwanted coupling, instability, radiation, etc. Prevent damage to the station from lightning discharges.

9 The Basics E (voltage) = I (current) x R (resistance) If I = 0, then E = 0. If R = 0, then E = 0. If E 1 = E 2, then the potential difference between E 1 and E 2 is 0, therefore the current that flows in a resistance between E 1 and E 2 is 0.

10 Bonding To prevent station damage, one must equalize voltage differences caused by lightning discharges. Bonding is the means by which the potential difference between conductive elements is made to be 0 volts.

11 Grounding When either an individual conductive element, or a system of elements, is at the same potential difference as the earth, they are said to be grounded and at equal-potential to the earth. Grounding is achieved through bonding of a system of elements to a grounding electrode.

12 Grounding Electrode A conductive element that is in contact with the earth is a grounding electrode. Typical examples of a grounding electrode: Ground rod. Metallic underground water pipe. Ground ring.

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14 Grounding Electrode Conductor The wire that connects (bonds) the ground rod to another element of the grounding system.

15 Building a Grounding System Grounding Electrode (reference to earth)

16 Building a Grounding System Grounding Electrode (reference to earth) Grounding Electrode System

17 Building a Grounding System Grounding Electrode (reference to earth) Grounding Electrode System Grounding Electrode Bonding Conductors

18 Building a Grounding System Grounding Electrode (reference to earth) Grounding Electrode System Grounding Electrode Bonding Conductors Grounding Electrode Conductor

19 Building a Grounding System Grounding Electrode (reference to earth) Grounding Electrode System Grounding Electrode Bonding Conductors Grounding Electrode Conductor Main Ground Bar

20 Building a Grounding System Grounding Electrode (reference to earth) Grounding Electrode System Grounding Electrode Bonding Conductors Grounding Electrode Conductor Main Ground Bar Bonding Conductors

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33 Questions

34 References National Press Photographers Association Dranetz-BMI French Astronomy Web-site

35 To learn more: Lightning Protection for the Amateur Radio Station – Ron Block, KB2UYT Part 1, QST, Jun Part 2, QST, Jul Part 3, QST, Aug Getting Down to Earth One of numerous application guides found at BiddleMeggar.com All About Lightning

36 To learn more: MIL-HDBK-419A - MILITARY HANDBOOK GROUNDING, BONDING, AND SHIELDING FOR ELECTRONIC EQUIPMENTS AND FACILITIES VOLUME 1 OF 2 VOLUMES - BASIC THEORY VOLUME II OF 2 VOLUMES – APPLICATIONS TM /AFM TECHNICAL MANUAL ELECTRICAL DESIGN - LIGHTNING AND STATIC ELECTRICITY PROTECTION Available for FREE download from: And Publications of the Headquarters, United States Army Corps of Engineers


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