IEC 60189-4:1968/AMD1:1974
修改件1 聚氯乙烯絕緣和聚氯乙烯護套低頻電纜和電線 第4部分：實芯聚氯乙烯絕緣配電線 成對、三聯、四聯和五聯
Amendment 1 - Low-frequency cables and wires with p.v.c. insulation and p.v.c. sheath - Part 4: Distribution wires with solid conductors, p.v.c. insulated, in pairs, triples, quadruples and quintuples