Electric system grounding inspection, diagnosis, & repair guide. ELECTRICAL GROUND SYSTEM INSPECTION - CONTENTS: Class on how to inspect electrical panels, home inspection procedures and safety, definition of ground, grounding, grounded, grounding conductor, grounded conductor, bonding, earth, earthing. POST a QUESTION or READ FAQs about how to inspect residential electrical wiring ground system, & about defects in electrical ground system wiring.

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Electrical ground system inspection procedures & checklists. This document discusses procedures the inspection of the grounding system components of a building electrical system when performed by trained building inspection professionals, home inspectors, electrical inspectors, and electricians. Green links show where you are. In 2. 00. 5 article 2. Grounding and bonding”. In the 2. 00. 8 NEC there has been a major revision in language, and phrases like “shall be grounded” have changed to “shall be connected to an equipment grounding conductor.”Sketches above and at page top courtesy of Carson Dunlop Associates.

Article Contents. Also see DEFINITIONS of ELECTRICAL GROUND, Grounding Electrode, Grounding Conductor, Grounded Conductor, Ground Wire, Neutral Wire, Ground Rod, for definitions of these confusing electrical terms. Why we need electrical grounding. The grounding system at a building provides an easy path for electricity to flow to earth should a problem, such as a short circuit, occur. Allowing current to flow to earth through the ground system helps assure that a circuit breaker will trip or fuse will blow should a problem occur. Properly operating these overcurrent devices help prevent fire and shock. Should an electrical fault occur where no ground path is present, the electrical potential is just sitting there waiting for a person to come along, touch some component of the system, and by accidentally providing a path to earth through their body, receive a burn or potentially fatal shock.

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Sketch courtesy of Carson Dunlop Associates. Details of why we need grounding, and definitions of electrical grounding and electrical bonding (what's the difference between these two terms) can be read at Why Grounding is Needed. Bud, a master electrician from Minnesota has offered these important clarifications. That function relies on a . This path *must*.

This function will work even if the service is. And the NEC *does not allow* earth to be used. One reason is the resistance of an earth path is too high.

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Assume the. earthing is only through a ground rod and the rod has a quite good 1. Further assume there is a 'short' connecting. The current to earth will be 1. A. There is a good. A circuit breaker. If the circuit is. In. the mean time, the .

It is back to the power source, and also. This would be better termed a *bonding* function. Carson Dunlop's sketch shows how the electrical current in a building can find its way to earth by way of the electrical grounding system. But as you may want to read in our case study of loss of all ground connections at a building, don't assume that the current will always find its way to earth. Loss of electrical ground at a building is extremely dangerous and risks electrocution. Some discussion points about electrical grounding are listed just below.

Required for safety, lets fuses blow. Example: toaster falls into metal sink.

Grounding Electrode Conductor wire from service equipment to. House plumbing (grounds the plumbing)Entering metal water pipe (grounds the system)Grounding Electrode (two now recommended)Continuous, no splices, meter bypass. Copper ground wires and grounding conductor (corrosion resistant)Aluminum - insulated solid conductor (See ALUMINUM WIRING HAZARDS & REPAIRS and also ALUMINUM GROUND WIRES)Aluminum - insulated multi- strand. Aluminum - bare vs.

If not, the system is waiting to electrocute the building occupant when s/he touches the live water/toaster in the sink and perhaps a nearby metal faucet, radiator, or other component that is ultimately connected to earth. Similar hazards exist at other building locations such as basement laundry equipment & sinks, at building tubs and showers, etc. In a properly- wired building, the grounding conductor and bonding system do not normally carry current, and would not be blamed for copper pipe pinholing etc. The grounding system is intended to conduct electrical current only in the event of a fault or emergency . Table of Electrical Ground Wire Sizes. Ground Wire Gauge CU (Copper) - wire size Electrical Service Size#8to 1.

A#6to 1. 25. A#4to 1. A#3to 2. 00. ASee Definitions of Electrical Ground, Grounding Electrode, Grounding Conductor, Grounded Conductor, Ground Wire, Neutral Wire, Ground Rod, for definitions of these confusing electrical terms. More details about electrical grounding can be read at ELECTRIC SERVICE GROUNDING SYSTEM INSPECTION andand at OLD HOUSE ELECTRICAL WIRING. Also, see details about electrical grounding at ELECTRICAL CIRCUITS, SHORTS,and at ELECTRICITY BASICS, HOW IT WORKS. At ALUMINUM GROUND WIRES we discuss proper repair of aluminum ground wires found in solid conductor branch circuit wiring. Guide to Inspecting Electrical Service Grounding Equipment. Readers should see our complete electrical ground inspection information at ELECTRICAL GROUND SYSTEM INSPECTIONThis article series describes procedures for safe and effective visual inspection of residential electrical systems including electrical panels and other components, when the inspection is conducted by trained building.

This information was presented by. Daniel Friedman - Inspect. Apedia. com, at & discussed by the Hudson Valley chapter of the American Society of Home Inspectors - . HVASHI Seminar 1. Sept 2. 00. 2, Updated April 2.

April 2. 00. 9. Carson Dunlop's sketch at page top shows where the electrical inspection starts at a residential property. Table of Electrical Ground Wire Sizes Required by Electrical Service Size.

Ground Gauge CU (Copper)Service Size#8 to 1. A #6 to 1. 25. A #4 to 1.

A #3 to 2. 00. A Electrical Service Grounding Defects & Conditions to Check For During an Electrical Inspection. Here are the Most- Common Electrical Service Grounding Defects & Conditionsnot found in sub panel feeder (a)attached to plastic pipe (b)attached to abandoned pipe. More about the galvanic scale and corrosion between dissimilar metals is at GALVANIC SCALE & METAL CORROSION. More about the galvanic scale and corrosion between dissimilar metals is at GALVANIC SCALE & METAL CORROSION. Notes on types of defects courtesy of Arlene Puentes. Sketch courtesy of Carson Dunlop Associates.(a) Equipment grounding conductor defect(b) Grounding electrode conductor defect.

More about the galvanic scale and corrosion between dissimilar metals is at GALVANIC SCALE & METAL CORROSION. What Other Defects Should We Check for in an Electrical Grounding System? Jumper wires to ground plumbing: As Carson Dunlop's sketch shows at (A), if the building plumbing includes DIELECTRIC FITTING CODES or non- conductive sections of piping (such as plastic piping) then the building plumbing system may not be safely grounded. Spelling note that may help some web searches: it's not dialectic pipe fittings, but dielectric pipe fittings.

A jumper wire is installed to assure that the building metal plumbing pipes are safely grounded to earth. The purpose of the ground jumper is to ground the building plumbing, not to use the building plumbing as a grounding system. That is to say, we're making the plumbing safe, we're not using it to provide a ground for the electrical system. The Dialectic Philosophy of Dielectric Electrical Separation of Materials. Thanks to reader Bill O'Reilly (not that one) for the following excellent comment.

Bill O'Reilly (not that one) said: There's a spoonerism in the .