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Taking the Mystery out of Equipotential Bonding Requirements For Swimming Pools
(image: https://i0.wp.com/picjumbo.com/wp-content/uploads/cue-on-the-pool-table.jpg)To explain the difference in grounding and bonding to me, a sage mogul as soon as used the analogy of a marriage. He explained that "grounding and bonding are like a wedding ceremony… Then after a little while, the husband gets grounded! " While this tale (if not totally true) was entertaining, it did nothing to take the thriller out of grounding and bonding for me. Perhaps nowhere within the Code is this thriller extra prevalent than at 680.26 dealing with equipotential bonding for swimming swimming pools and related installations. I would nominate this NEC part as one of the most misunderstood and misinterpreted sections in the whole Code. Historically, this section is one in every of those who undergo a few of essentially the most dramatic revisions from Code cycle to Code cycle. In this text, we will try to take the "mystery" out of this one area for equipotential bonding for swimming swimming pools and related installations.
(image: http://www.seaglasspools.com/inground-pool/fiberglass-swimming-pools/images/figure-8-fiberglass-pools.png)Bonding necessities are an important and distinctive protecting method employed to increase the safety of the customers of bodies of water similar to pools, spas, and hot tubs. Bonding connects the conductive components of the pool structure, nearby metallic objects, and electrical gear enclosures together. Bonding is required to remove voltage gradients (rises in voltage potential) in the pool area. When metallic parts are bonded collectively, they effectively eliminate differences of voltage potential that may exist between the person conductive parts and thus scale back the shock hazard. If these metallic conductive elements should not bonded collectively, this leaves these conductive components having the potential of being at completely different voltage potentials. In a case like this, the human physique can serve as a "conductor" between two conductive parts at totally different voltage potentials if contact is made with these conductive components. If a conductive path is offered between two conductive parts at completely different voltage potentials, this current is going to naturally equal itself out between these conductive components.
An electrical shock occurs when the human body is used because the "conductor" between these conductive elements. If these conductive parts are mechanically, electrically, and intentionally bonded (married) together, there is often no shock hazard present as these conductive components are at all times at the identical voltage potential. Once called the "common" bonding grid, it was modified to "equipotential" bonding throughout the 2005 NEC to help clarify and describe the function and purpose of this part. Now is an efficient time to explore the different purposes served by bonding and grounding and to develop a clear understanding of the 2 phrases. Bonding is used to equalize voltage potential differences to reduce shock hazards between totally different parts of the Fiberglass pool shells for sale with delivery by connecting potentially conductive parts collectively. Grounding includes providing a low-impedance, floor-fault return path from the gear required to be grounded back to the source of the electrical system, typically through the tools grounding conductor routed with the department-circuit conductors. This path facilitates the operation of the fuse or circuit breaker to permit it to take away the faulted condition.
Briefly, bonding means "connected together," while grounding means "connected to earth." Grounding and bonding together provide the security from shock hazards that's so important, notably in an aquatic setting equivalent to a swimming pool. Since a number of types of electrical gear generally used with swimming swimming pools, scorching tubs or spas which can be bonded together should even be grounded, an interconnection between the grounded (neutral) conductor and bonding grid exists. Swimming swimming pools, spas, and sizzling tubs current special shock hazards to people. The water is blended with chemicals, which often enhance conductivity. Individuals are in direct contact with the water and encounter grounded objects corresponding to metallic ladders. Electrical gear is used to circulate and heat the water and for other associated features similar to illumination. The Code necessities, if carefully adopted, will scale back the electric shock hazards to a suitable degree. One of these measures is the bonding together of conductive portions of the pool and metallic elements of electrical equipment related to the pool.
The goal is to offer a technique of equalizing the voltage potential of all tools and components. If carried out properly, there will probably be no present circulation between these elements that could be dangerous to personnel. The required bonding is accomplished by connecting all the elements together by an adequately sized and properly connected collection of copper bonding conductor(s) or other recognized bonding methods. The Code describes the essential bonding necessities and offers a listing of items required to be bonded together. 1. All steel parts of the pool construction, including the reinforcing steel of the pool shell, coping stones and deck. The standard steel tie wires are considered suitable for bonding the reinforcing steel collectively, and welding, brazing or special clamping is not required. These tie wires should be made tight. Reinforcing steel successfully insulated by an encapsulating, nonconductive compound at the time of manufacture just isn't required to be bonded.
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