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That depends on what you mean by "box in". You must always provide access to an electrical panel.
The use of a resistance box or a "Decade Box" is to help calibrate instruments used to measure electrical values such as Voltage, Current, and Resistance. Without them you would not have a known value of resistance to use as a set point.
The size of the breaker is determined by the smallest conductor used in the system and by the type of load being serviced.
Electrical symbols are used in electrical wiring diagram, signage on the electrical devices and motors
An electrical safety device that can be reset and used again fits the description of an electrical circuit breaker.