YGCB硅橡胶扁电缆,A 类系统—该类系统任何一相导体与地或接地导体接触时，能
在1min 内与系统分离；YGCB硅橡胶扁电缆
B 类系统—该类系统仅包括单相接地故障短路时运行的条件，
接地故障时间应不超过1h，但在任何情况下，最长不超过8h，
每年接地故障总持续时间不超过125h；YGCB硅橡胶扁电缆
C 类系统—不属于A 类、B 类的系统。
System category A—This category comprises those systems in which any phase
conductor that comes in contact with earth or an earth conductor,is disconnected
from the system
with in 1 min.
System category B—This category comprises those system which,under fault
conditions,are operated for a short time with one phase earthed.This period should
not exceed 1 h.For a longer period,not exceeding 8 h on any occasion,can be
tolerated.The total duration of earth faults in any year should not exceed 125 h.
System category C—This category comprises all syatems which do not fall into
categories A and B.
