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Power supply to the furnace must be N.E.C. Class 1, and must comply with all applicable codes. and/or The Canadian Electric Code CSAC22.1. Use a separate fused branch electrical circuit containing properly sized wire, minimum 12 gauge, and fuse or circuit breaker. The furnace must be electrically grounded in accordance with local codes or, in their absence, with the latest edition of: The National Electric Code, ANSI NFPA 70. The fuse or circuit breaker must be sized in accordance with the maxim