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Recently Siemens has increased the 415 V HRC fuse breaking capacity to 120 KA, Why it happens?? As a end user how we can choose right breaking capacity for 415 V system ?? particulraly for 415 V Motor Feeders.

Dear 7anoter4, Thanks for guidance but as you well aware the earthing grid acroos the plant (industry)passing thr several steel structure and if we adopt current injection method, practically it's not possible. If any other way to test it, let us know. Thanks

Pratically speaking tnay motor in prolong condition during starting the driven equipment/system should be checked first. But here as you have opted all the do's, i think if Motor protection relay is having thermal meter you can record the thermal contents ( can be compare with old record also...

In electrical maintenance field there is a practise to measure Earth resistance of earth pit on periodic interval. Is there any method to check/confirm the continuity of the earth conductor between earth pit (grid) to the equipments Generally population of the electrical equipments are too...