guangxi cable news: detection method of cold resistant cable
from：guichao author：admin click： 338 addtime：2017-04-21 17:28:55
in the north of china, especially in northeast china,
when it comes to winter, the temperature drops to a few degrees below zero,
in this case,
general power cable in the construction of a short period of time,
cable outer sheath becomes brittle and easy to crack,
bending performance and many other disadvantages,
forced construction is likely to cause a huge waste of materials and security risks,
therefore, the use of special cold resistant antifreeze cable.
china's national standard gb12706 provisions:
the test method of the low temperature resistance of the cable is: -15,
the tensile strength of the cable sheath material is not less than 20%,
and in the same ambient temperature of -15 deg c, with the weight of 1kg,
release cable sheath material from 1 m height,
check whether the material surface cracks.
code for design of electric power cable in gb50127-2007
code for construction and acceptance of cable lines, gb50168-2006 "electrical installation works
at the same time, pvc (ie pvc) sheathed power cable construction
the ambient temperature shall not be less than 0 deg c, the ambient temperature shall not be lower than -15.
combined with the above national standards is not difficult to find,
at present our country uses the standard to the ordinary power cable,
the test conditions are -15 deg c and the installation temperature is 0 deg c,
as for the cold resistant cable construction in cold regions of northeast and northern inner mongolia, there is no specific guidance data.
the international standard of csa22.2no.51-94,
the environmental temperature of low temperature test for power cable is -40 and -25,
compared with the national standard, the cold bending test of the cold resistant cable body was increased by -40,
and the weight of the hammer used in the cold impact test is increased from 1kg to 1.36kg.