Low voltage power distribution equipment main electrical parameters are rated current, rated short-time resistance current (c, 15), rated current peak tolerance (k, 0.15), rated dispersion coefficient, protection grade, internal isolation form and so on. Among them, the peak current, current short tolerance, tolerance current and degree of protection for in the product manual, and generally do not give in internal isolation form manual, dispersion coefficient is a parameter of the product test although most of these parameters are often contact, but it's not easy to comprehend.
The rated current generally refers to the rated current of the incoming switch of distribution equipment.The rated current of distribution cabinet generally refers to the maximum current of horizontal bus, which is often equal to the rated current of main switch of receiving cabinet.The sum of the rated current of all feed cabinets is multiplied by the simultaneous coefficient to obtain the rated current of the main bus.The rated current of the feed cabinet generally refers to the current of the vertical bus. The rated current of the vertical bus should be greater than the rated current of the feed circuit multiplied by the dispersion coefficient.In the distribution design, the rated current of each cabinet should not exceed the rated current specified in the manual.Because the current is too big, the influence of temperature rise inside the cabinet is big.If limited by conditions, the size of the cabinet and conductor can be increased to ensure that the temperature rise is limited within the standard range.
