Should the cable shielding layer be grounded at one point or at two points?
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Should the cable armor or shielding layer be grounded at one point or at two points? Single-core cables are undoubtedly grounded at a single point. What about three-phase motor cables – are they grounded at two points? And what about motor control cables – are those also grounded at two points? For the inverter’s analog signal input and output cables, should they be grounded at two points? What about the electrical and instrumentation interconnection cable? Two-point grounding?
The shielding layer is used to prevent electromagnetic interference, and it should be grounded at one point. The armor layer of an armored cable serves a protective purpose and should be grounded at two points.
Three-phase motor cables: two-point armored grounding. Motor control cables: two-point armored grounding. Inverter analog signal input/output cables: single-point shielded grounding, with connection at the instrument cabinet side. Electrical and instrumentation interconnection cables: single-point shielded grounding, with connection at the instrument cabinet side
The analog input AI of the inverter should be connected on the electrical side. Why is the motor control cable grounded at two points through its shielding? Some people say that a welding machine once caused the cable to get damaged due to the shielding
You can use Baidu Wenku to search for the article titled \"Standards and Specifications for Grounding of Shield Layers\" related to PASF2015; it provides detailed explanations regarding the grounding of various power, control, and instrumentation cables as well as the sources of these specifications. I hope this will be helpful to you.
Very good, thank you. I understand 80% of it now