Some boxes are now available with approved reducing knockouts that do not require jumpers, and are marked to identify them as such.– Paint and other nonconductive coatings prevent contact between an enclosure and fittings. Article 250 covers the grounding requirements for providing a path to the earth to reduce overvoltage from lightning, and the bonding requirements for a low-impedance fault current path back to the source of the electrical supply to facilitate the opera-tion of overcurrent devices in the event of a ground fault. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. 0000018119 00000 n 0000000016 00000 n Most situations can be addressed by applying the basic principles discussed above. 0000041042 00000 n But, if we run a green-colored insulated conductor between the three boxes, utilizing the PVC conduit as a raceway, and then attaching the conductor to the inside wall of each metal box with an approved green bonding screw, we have then successfully “bonded” these three metal boxes together. As a result, leads many to misunderstand and come to the wrong conclusions. Methods may include jumpers (Fig. Series vs Parallel Circuits: What's the Difference?
The presence of this third prong indicates that the appliance has a grounding system, and it is essential that these be plugged into grounded outlets. After finding out that we are completely out of EMT (metal thin-wall) conduit on the jobsite, I decide to install a 10’ piece of PVC (plastic) conduit between the three metal boxes so that I can complete the job today. 0000001642 00000 n Knowing when to ground a generator is critical for operator safety.
startxref In these cases, ungrounded power systems are used, but they contain ground fault detection devices that provide a warning when a fault exists.For this article, a grounded supply system is assumed (Fig. Bonding is more clear word compare to Grounding and Earthing, but there is a micro difference between Grounding and Earhing. Section 250-104(b) requires that the bonding be to the grounding electrode system, which I consider also to mean in accordance with Section 250-66. 0000003543 00000 n It cannot reliably provide the necessary low impedance ground path. The breakers or fuses serve two functions: They protect the wires against overheating in the event that they are overloaded by too much electrical current being drawn through them; they also sense short circuits and trip or "blow" to instantly stop the flow of current when problems occur.
0000004844 00000 n There are two (2) methods for testing an electrical grounding system.
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