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CSA Certified to C22.2
Presently CSA Standard C22.2 No. 29, Panelboards and enclosed panelboards, requires that the service switching means must be located within the service box (Clause 7.4.1.1) and that "The main switch or circuit breaker shall be located in a separate section of the enclosure with a sheet-metal barrier or the equivalent, of the same thickness as the walls of the enclosure, having bushed holes or the equivalent, for the necessary wiring between compartments" (Clause 7.4.1.2).