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Main bonding connects "extraneous conductive parts" such as mains water / gas supply pipes, structural parts of buildings, communication cable sheaths, lightning protection systems etc., to the main earthing terminal. [15] These parts could otherwise introduce potentials that are different from the potential of the installation's earthing system.
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Maxwell's equations on a plaque on his statue in Edinburgh. Maxwell's equations, or Maxwell–Heaviside equations, are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, electric and magnetic circuits.