If the result shows that the resistance is under 1 on the meter, after the first 60 seconds, it likely means that the cable has an issue and needs to be removed. If it reads between 1 and 1.35 on the meter, the cable is fine. Higher readings are going to be even better. Keep recording every 30 seconds. The resistance should continue to increase with each subsequent reading. If it does not, then it means that there could be an issue and that the insulation is failing.