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Weighing equipment must be certified as "legal for trade" or "trade authorized" in any business setting where products are sold by weight. This basically implies that the apparatus has been put through a rigorous series of testing to make sure it is sufficient accurate and appropriate for the task at hand. In the US, Handbook 44 outlines the specifications for lawful for commerce weighing equipment (Specific Tolerances and Other Technical Requirements for Weighing and Measuring Devices). T …

Although single-phase electricity is used to supply common domestic and office electrical appliances, three phase alternating current (a.c.) systems are almost universally used to distribute electrical power and to supply electricity directly to higher power equipment.This technical article describes the basic principles of three phase systems and the difference between the different measurement connections that are possible. Three-phase systems Wye or Star connection Delta connection …