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The grounding system of a distribution must be from zero ohms to a maximum of two ohms. This is usually obtained by bonding all metallic parts back to the distribution centre with a wire capable of handling the circuits fault current if the circuit should ground out. The ground wire in cable sets is used for this purpose.
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What is a strap or yoke on a duplex grounding receptacle?
The yoke or strap is the metal fram that hold everything together and where the outlet attaches to the box.
Is it necessary to ground at all metal junction boxes when using metal conduit or cable?
In a completely metallic conduit system it is not necessary to ground each junction box as long as the metallic system has the grounding capacity rating larger than that of the over current device protecting the circuit. The code book states what size conduits are rated at, for grounding amperages.
Where do you hook the ground wire on a porcelain light fixture on a metal box?
Connect the ground wire to the metal box.
Where do you connect the bare ground wire?
Usually there is inside the fuse box a metal bolt and nut provided or a rail in case the box itself is made out of plasic. Typically there is a sticker with the earting symbol next to it(http://www.kpsec.freeuk.com/symbol.htm) Join the green/yellow cable to that one, or the color used in your country
How do you Ground a 3 wire service?
If you do not have a underground metal water pipe coming into the building then you put a ground rod at least 2 feet from the buildingf into the ground attach one end of the wire to ground rod run your ground wire and attach the other end to the neautral bar in the panel box. You need special transformer called as grounding transformer for this purpose. Grounding transformer is basically Wye-Delta type transformer with Wye connected winding connected to 3 line wires and derived neutral from Wye side grounded through desired grounding device. Delta side winding of grounding transformer is kept at no load.
