Brass Neutral Links Brass Neutral bar Earth bars from Jamnagar city India. These Brass neutral links, earth bars, terminals bars are used for switchgears control panels, isolators and other electrical installations. These are used for Ground or earth in a mains (AC power) electrical wiring system is a conductor that provides a low impedance path to the earth to prevent hazardous voltages from appearing on equipment and “earth” are used Under normal conditions, a grounding conductor does not carry current.