How should a three-level distribution box be protected

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They stop problems like overloads, short circuits, and shocks before they start. According to the hierarchical and branch circuit principle, in a three-level distribution system, no electrical equipment shall be connected by bypassing levels. As described in the CNSSI 7003, a PDS is the preferred solution for protecting National Security Information (NSI). 6kV (excluding primary substations) and 400V networks is covered by CP331, which details standard relay settings and fuse sizes to be used.

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