In North America the answer would be no. The pin configurations for voltage and amperage all differ. This is so that an under voltage or under current device can not be used on higher amperage's and voltages.
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If the plug fits you are good to go. The typical range of residential voltage is from 110 to 125 VAC. You are fine within this range.
You would have a code violation, only a 50 amp/250V plug would fit into a 50 amp/250V receptacle. You would not have proper overload protection, the load could (worst case) call for more amps than it is rated for and catch fire before the breaker tripped.
Generally, a 15 amp plug.
Sure
There are 1000mA in one amp. So there is 0.25 amp in 250 mA.
If the plug fits you are good to go. The typical range of residential voltage is from 110 to 125 VAC. You are fine within this range.
yes
Electrically yes it is safe but the pin configuration will be different.
Not really. The 6.3 amp fuse will allow about 50% more current through the circuit than the 4 amp fuse. The extra drain may damage things.
You would have a code violation, only a 50 amp/250V plug would fit into a 50 amp/250V receptacle. You would not have proper overload protection, the load could (worst case) call for more amps than it is rated for and catch fire before the breaker tripped.
The wires in the plug are backwards. switch them around
well you plug your sub into your amp you do have an amp write
Generally, a 15 amp plug.
Sure
A motor that is rated at 250 full load amps will need 400 amp time delay fuses or a 500 amp frame breaker with adjustable amperage trips. The wire size for this motor has to be 125% of the motors FLA. 250 x 125% = 312 amps. A 350 MCM copper conductor with an insulation factor of 90 degrees C is rated at 325 amps.
You should not load a 125 amp panel any more than 100 amps.
There are 1000mA in one amp. So there is 0.25 amp in 250 mA.