This standards publication encompasses:a. All ratings for outdoor circuit breakers above 1000 volts for alternating-current service. (Automatic circuit reclosers are excluded.) Circuit breakers for service in metal-clad enclosures are included in NEMA Standard SG 5.b. Attachments for these circuit breakers@ such as bushing current transformers@ bushing potential devices@ interlocks@ undervoltage trip devices@ shunt trips@ overcurrent trips@ and auxiliaries sold with the circuit breakers such as closing relays and structural steel supports.c. Renewal@ modernizing@ and spare parts for these circuit breakers and attachments.d. Recommended installation@ operation@ and maintenance procedures.?