The closest thing I could find out is that the cable is listed for use with the Repeater Set, Radio AN/ TRC(V) NSN 5820-00-868-8208. TM 11-5820-535-24&P
As listed for use with the two generators PU-618/620 which are 5 KW units.
The plug on the end of the cable is listed as part number U-237 B/G with NSN 5935-00-134-5266.
If you can find out what other generators use that plug and I would suspect nothing over 5KW, should work.
From ZiggyO The U237 can also be found on many variants of the s-250 and s-280 shelters...... I have several to bring power into my shelters.......
Well, I drug out one of the oldest TM's in the power generation world, TM 5-6115-365-15. This is the Grand Daddy of the PU and PP world. Print date of 1966, and was updated/changed 11 times. Looked up the PU 618, (PDF reader pages 87-124). Then looked at some of the other PU's and PP's. Cables, would not, and have never been listed as additional items for small PU's and PP's. Then I sat and thought about it a while longer. I remember us getting a new PU 619, (same as the PU 618, just with 10 KW gen sets) back in 73-74. It came with all the things listed in the TM, but there was no cable, cable reels or pig tails for the COMMO rigs we had. Those items were listed in the TM's for the COMMO rigs, or in the S-250 TM's. As additional Items. This was a very common cable, in the commo world. Fit lots of stuff, like Ziggo mentioned. It was confined to 10 KW and below. Having run about 10,000 of this cable out, and reeled it, (cable reel RL-31?) back in on maneuvers and training, I have to say it was a very robust cable. The heads were prone to the plastic chipping/breaking, but were easy to fix. In the late 80's when the Army was trashing lots of stuff, mega miles of this cable wound up in DRMO, scrap cable heap. I don't think I uploaded the TM 5-6115-365-15 in the Forum. If anyone has interest in it, let me know. I will post it.