Regarding instrument cable diagrams, number of cable cores, cable selection
Thread Content
What is the cable number for? How are the specifications and length of the protective tube determined? How to determine the cable model? Cable specification – for example, 3*7*1.5: does it mean 3 cables with 7 cores each and a diameter of 1.5? How is the number of cores in a cable determined? The people in the office told me that different gauge cores also don’t work; so how is the number of cores determined? How is the length of the cable determined?
Please forgive me; I’m just a beginner and don’t know anything. There is no master to guide me. We can only do it slowly like this :'(:'(
...Are the experts getting annoyed by such stupid questions?
3*7*1.5 ? There is no such cable. You don’t understand, and I don’t either.
It seems that the 7 here should be changed to 2; it would be more appropriate. The formula is logarithm × number of cores × nominal cross-sectional area of the conductor. I suggest you download the cable sample manual from the manufacturer, as it contains very detailed information on this topic.
This post was last edited by jujiangliu on 2016-1-6 at 16:54. 3*7*1.5 indicates that there are 7 groups of 3-core wires in one cable, with each wire core having an area of 1.5 MM2. For example, three-wire thermal resistors require cables with 3 cores per group, and 7 such groups of cables can be used to connect 7 thermal resistors.
It should be written as 7*3*1.5
Now I understand. 7*2*1.5: 7 wires, two-core, with a cross-sectional area of 1.5
Thank you so much! ! ! Thank you