Any idea? In ASTM E 1444 mentioned are the two rings, if you use the KETOS hole #6 indication should be visible @ 3400 amps, whereas using AS 5282 @ 3500amps, indication from hole #9 should come out. Why is this so? I did some research and unfortunately it added to the confusion as sometimes they refer to AS 5282 RING as AS 5282 KETOS RING also. So which is which?