SG 4-2000

Alternating-Current High-Voltage Circuit Breakers


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标准号
SG 4-2000
发布日期
2000年01月01日
实施日期
2009年06月17日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
NEMA - National Electrical Manufacturers Association
引用标准
57
适用范围
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.?




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