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The statement "no more than 400 amps per phase per half hour demand" typically refers to an electrical power supply context, often related to industrial or large-scale commercial electricity usage. Here’s what it generally means:
- Amps per Phase: This indicates the amount of electrical current (in amperes) flowing through each phase of a three-phase electrical system. In this case, it specifies that the maximum allowable current per phase should not exceed 400 amps.
- Per Half Hour Demand: This part refers to the time period over which the current demand is measured. It suggests that the maximum current of 400 amps per phase is allowed as an average over a half-hour period. This is important in scenarios where electrical loads can vary significantly over time (e.g., in factories or large buildings).
In practical terms, this statement implies that the electrical system or the equipment connected to it should not draw more than 400 amps per phase continuously over a half-hour period. Exceeding this limit could lead to overheating of wiring, equipment failures, or potentially tripping of protective devices like circuit breakers or fuses, which are designed to prevent damage from excessive current.
Therefore, adhering to this limit ensures safe and efficient operation of the electrical distribution system, preventing overload conditions that could compromise safety and reliability.