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0000006612 00000 n The loop impedance is the sum of all impedances in the faulted circuit, including the supply transformer, the ungrounded conductors, and the grounding circuit. Bonding and Grounding Flammable iquid Transfer Figure 2 illustrates the bonding and grounding steps necessary when using a drum pump. Bonding, Grounding and Earthing One of the most misunderstood and confused concept is difference between Bonding, Grounding and Earthing. 172 0 obj<>stream In addition, non-current-carrying metallic components in a facility, such as equipment cabinets, enclosures, and structural steel, need to be This amount not only ensures that the connection exists, but also that it can reliably carry fault current. Though we have successfully bonded these three metal boxes together by connecting them with the green-colored insulated conductor, we have not yet installed a conductor connecting the three metal boxes to the grounded electrical panel. For example, a loop impedance of 1 ohm on a 120-V circuit would allow 120 amp to flow, causing the circuit protector to trip very rapidly.

0000041794 00000 n Not all homes have this elaborate and complete grounding system formed by a network of bare copper wires. T[…]Section 110.21(B) states that if caution, warning, danger signs or labels are required by the NEC, the labels shall “adequately�[…]When Does My Georgia Air Conditioned Contractor License Expire? 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. The manufacturers of these instruments provide information and training on proper application techniques.For cord-connected equipment, the same low-resistance meter can be used to measure the resistance between the power cord grounding conductor and the equipment housing, which should typically be 0.1 ohm or less. 0000038650 00000 n Most situations can be addressed by applying the basic principles discussed above. All fittings that are relied upon for bonding must be approved for the application by a nationally recognized agency and marked as such, and must be installed properly.– Nonmetallic conduit, fittings, or boxes would interrupt a grounding circuit through the conduit. A bonding jumper must be used around them to ensure that the individual pieces are electrically connected.– Eccentric or concentric reducing knockouts on most existing boxes cannot carry fault current reliably, since the small tabs that connect them to the box will act as fuses and melt open. Search Products And Discover New Innovations In Your Industry You have […] This grounding system provides a path of least resistance for electricity to follow back to ground should a break in the wiring system allow electricity to "leak" out of the preferred system of black and white circuit wires. 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. While this device indicates problems such as reversed wiring or an open wire, it is useless for indicating ground circuit integrity. Get daily tips and tricks for making your best home. In standard sheathed NM cable, this bare copper wire is included along with the insulated conducting wires inside the cable. Metal Frame of the Building or Structure where the following methods are used to make an earth connection: (1,2,3,4) The terms Grounding and Bonding are found throughout the NEC text, and while they are seemingly interchangeable, they are actually two distinct procedures when it comes to the National Electrical Code and installing electrical equipment.. To prevent this danger, your home's electrical system includes a backup plan—a system of grounding wires that runs parallel to the hot and neutral wires. 0000005585 00000 n 0000006015 00000 n It is essential to replace these properly when maintaining or servicing the equipment.– Whenever there is uncertainty about the existence of a reliable electrical connection, a bonding jumper should be used.With the proliferation of sensitive electronic and computerized equipment, as well as harmonic producers such as solid state drives, the issue of electrical “noise” has become of much greater importance. Bonding jumpers ensure a solid electrical connection between conductive parts.

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