Randy, I also have many old NEMA 1-15 recepts with a 240V rating, and one of those really odd ones which function just like the T-slot type. Something interesting about all of these old recepts with a dual rating is that they are rated for only 10A at 240V. So if one of these were wired for 240V then wouldn't it need a 10 amp fuse or breaker? [Linked Image] Has anyone ever seen a 10 amp fuse in an old panel? (...most likely in a fuse block with 2 of these 10A fuses for the 240V.)