A.±2% B.±2.5% C.±3% D.±4%
A.100;200 B.200;300 C.100;300 D.300;400
A.爬電比距=絕緣子爬距/額定線電壓 B.爬電比距=絕緣子爬距/額定相電壓 C.爬電比距=絕緣子爬距/最高線電壓 D.爬電比距=絕緣子爬距/最高相電壓