No, it would not be safe because 250v is too high for that breaker.
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In North America all household breakers are rated at 120/240 volts. A 250 volt 15 amp breaker would would be a two pole breaker and take up two slots in the distribution panel. This can be pulled out and replaced with two separate 15 amp breakers or one 15 amp breaker and a slot panel filler to cover the second slot.
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.
No, the amperage pin configurations are different between a 15 amp and a 30 amp plug.
50 amp breaker.
Use the correct fuse and nothing else.
No there are no adapters made for these types of installations. The reason there are no adapters is to provide a factor of safety. To plug a 30 amp plug into a 50 amp receptacle could allow 50 amps to be applied to a 30 amp rated cord. The 50 amp receptacle is more than likely being fed by a 40 amp breaker. Just change the plug cord to match the ampacity of the breaker ahead of the 50 amp receptacle. Or change the 50 amp receptacle and 40 amp breaker to a 30 amp breaker and use your existing cord plug.
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.
Yes as long as you change the 50 amp breaker to a 15 amp breaker. You will be hard pressed to get the 50 amp #6 wire under the terminals of the 15 amp receptacle.
No, the amperage pin configurations are different between a 15 amp and a 30 amp plug.
No, it is against the National Electrical Code to wire a receptacle with the wrong voltage. You should call a qualified electrician to change the 250V receptacle to a 125V receptacle.
Not unless you change the wiring for that circuit. The breaker protects the wiring and if you install a 40 amp breaker on a 15 amp wire circuit you will have a fire in your home.
50 amp breaker.
Divide the watts by the voltage to get current (amps). 60W / 250V = about 1/4 Amp.
Replace the 30 Amp Breaker with a 15 Amp breaker.
Use the correct fuse and nothing else.
No there are no adapters made for these types of installations. The reason there are no adapters is to provide a factor of safety. To plug a 30 amp plug into a 50 amp receptacle could allow 50 amps to be applied to a 30 amp rated cord. The 50 amp receptacle is more than likely being fed by a 40 amp breaker. Just change the plug cord to match the ampacity of the breaker ahead of the 50 amp receptacle. Or change the 50 amp receptacle and 40 amp breaker to a 30 amp breaker and use your existing cord plug.
A 50 amp breaker is an overcurent device.
You have a double pole breaker for 240Volt supply. The maximum current is 15 amp.