Plug fuses in a disconnect switch box wired for 240v : aka Teach me about Plug Fuses

It's the amperage that takes out the fuse. Voltage has little to do with it at least in this case.
 
SLK001 said:
This is not legal. If you put in a 50 amp plug, the wiring has to be 50 amp rated. You can put a 30 amp plug on a 50 amp circuit, but not the other way around.
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Depends on local code.

The WIRING is the critical part.

If you have 30 Amp wiring then 30 Amp breaker.

We use dryer outlets for 220 VAC connections for welders and lathe, 220 vac only so L1, L2 and safety ground.

Outlet rated for more than 20 amps but lathe is only 2 hp so it has 20 Amp breaker.

Another one near center of shop also 20 Amp, limits in conduit for number of wires so smaller wire and is fine for most.

Have roll of large wire to add large outlets, did one for compressor, 7.5 hp.

Welder specific someday.

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I am pretty sure you absolutely can not put a 30amp outlet on a 50 amp circuit. If 50amps of current flows through an outlet rated for 30amps, it could melt. I will double check if there is any local code for the outlet that supersedes the code book and change if necessary.

As for the box, I'm going to buy a new one.
 
If you put a 50 Amp outlet on a 30 Amp circuit the breaker limits to 30 amps.

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