We test our grounds yearly. You mentioned the fault current going through your pintle hook, do you isolate your anchor with a link stick now?Working and testing grounds, they were the best ones I have seen in my life. For twentt years just put that welding cable up and your safe. Always thought that. I was going through grounds and testing them and they were all failing. And these were fairly new grounds. I was cleaning like crazy and testing them again, still failing. I was putting on new ferrule heads, still failing. Then I started running my hand and found all the cuts from the wear. The insulation is rubber and then their is a water tight saran wrap type barrier underneath that. If there is a break in it, the corrosion starts and the welding cable strands break like dry kindling. After you mess with a bunch that failed, you will recognize a bad ground. It will have a cut and be really floppy because the strands broke. Seen a 4/0 ground have enough breakage it would be equivalent to less than a 4. And I found that those with the silver tin replaceable teeth and ferrule fitting tested better than anything else. I was ignorant before and now enlightened.
Got a question for guys who work with breakers at a sub. When you have a "one shot", what are the specifics of when it will lock out . . . Amps, cycles, etc? And if you know that info, do you know if that is a standard or code throughout the US. If you have a bad personal ground, its got to go off like a bomb. I remember we were pulling wire when I was an apprentice, and we were at the reel end. A wind gust came and a layed out ratty wire went sideways. We had everything grounded: the rolling ground, the reel trailer, the operator grate. . . Three grounds driven hard. And the funny thing was the fault current went through our pintle hook of the trailerto the digger and caught the wooden pads on fire. The only good thing was there was only two strands melted on the contact point of the 795 we pulled in.
Its amazing to me how ignorant I was to my personal grounds. I never took care of them. Never had them tested. Never did the EPZ, because everyone thought it was stupid. I layed them up, stepped on them with my hooks. Was stupid. And when you do corridor work, you find out how important they are.