Answer / ajaz sarwar

Grading rings also called corona or anti-corona rings, made up of conductive material attached to the terminals of high voltage equipment to reduce the peak value of electric potential gradient below the threshold value of corona. 

Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices

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