Discussion on the setup and management of tier 3 boxes
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Configuration of the three-level distribution boxes at the construction site: Each distribution box is equipped with a single leakage protection switch, with a threshold of 30 mA or 15 mA, and a response time of 0.1 seconds. If the distribution box is equipped with plug outlets, it should be locked for management ； If there is no plug and the cable exits, the distribution box does not need to be locked. Secondary distribution boxes must be locked for management.
I think tertiary cabinets should all be managed with padlocks; sometimes there is more than one load in a tertiary cabinet as well