cord-and-plug
Can someone identify this plug?
It came on an older radial-arm saw. Can I replace the plug with a NEMA equivalent that will fit in a regular socket? Not sure where it'll go, but all the locations I'm considering would be easy to put in a new breaker and run a line if it needs either 240V, or higher amperage.
Nameplate:
If I'm reading this correctly I can open up the wiring, connect as directed for 115V and then I just need a 10 amp, 60Hz, single-phase circuit – ie. normal wall outlet.
Thanks
It's very likely to be a proprietary connector. Even if it conforms to a standard size like DIN (as @Trout suggests), that doesn't really tell you anything about the electrical requirements. The part your missing may have a transformer, a dimmer, or allowed ganging of several lights together.
Unless you find more markings on the bulb or cable, I would not assume anything about the lamp — could be DC or AC, could be 220V, 110V, or low voltage.
(You don't say what country you live in or whether the lamp is likely to be foreign. There are several countries that use plugs with 3 round pins in approximately the configuration of your plug, but yours looks smaller. It's a little hard to tell scale from that photo... any chance of pin-to pin-measurements?)
It looks like an NF C 61-315 standard French single phase plug:
These are are rated for 400V, 32A on a single phase. The socket you have pictured looks like a French style Schuko (CEE 7/3), which is typically only rated to around 16A. My guess is that unless you already have a socket that was intended for use with an electric stove, the wires are likely not a suitable gauge to handle the current demand.
If you have an outlet with the appropriate wire gauge, it would probably just be a matter of replacing either the outlet or the plug. If you have any doubts, I'd consult an electrician before attempting to connect it.
Image credit: "Power connector Legrand 32A" by Kae - Own work. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Power_connector_Legrand_32A.jpg#/media/File:Power_connector_Legrand_32A.jpg
Best Answer
That is a twist-lock-style plug used with receptacles like this:
Receptacles are still available - I have no idea if it's code-allowed to use them, they're not at all common in my experience.
I would also be inclined to replace the plug for use with a normal common socket. Check the electrical ratings on the equipment for how many volts and amps it uses. These twist-lock receptacles I found go from 120V/15A up to 220V/20A so what's safe and proper would depend on your device/appliance.