NBN C 30-811-3-1-1992 电缆的绝缘和护套材料的通用试验方法.第3部分:PVC化合物专用试验方法.第1项.高温下的耐压试验,抗开裂试验
COMMON TEST METHODS FOR INSULATING AND SHEATING MATERIALS OF ELECTRIC CABLES Part 3 : Methods specific to PVC compounds Section One - Pressure test at high temperature - Tests for resistance to cracking