Answer for USA, Canada and countries running a 60 Hz supply service.
If they fit, which I doubt, yes, you can use 600 volt fuses in place of 250 volt fuses so long as the amp rating is correct.
YOU CANNOT USE 250 VOLT FUSES IN PLACE OF 600 VOLT FUSES !!!
You can use a fuse with a higher volt rating but not a smaller volt rating than the voltage applied to the circuit.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
France uses 220-240 volts for their electrical system.
No a 208 volt outlet does not need a neutral. 208 volts is the line voltage between any two legs of a three phase 208 volt system.
12 volt
Electrically yes it is safe but the pin configuration will be different.
20 amp on a 12 volt system
No
Can I run 480 volt , 60 HZ motor at a 380 volt , 60 Hz system?
No. Is a 6 volt system.
1967 was the first year for the 12 volt system in the VW's.
No.
If you jump a car or other vehicle with a 6 volt electrical system using a 12 volt battery, you can blow out the 6 volt battery. When they are connected, it usually only takes a fraction of a second to start the six volt system. There should be a person ready to start the 6 volt system immediately if not sooner so the 12 volt system can be disconnected immediately before the battery overheats and burns out.
12 volt
No, you cannot.
No.
5000 volt
Originally it would have been a 6 volt system.
Most cars use a 12 volt system. Most cars built before about 1956 used a 6 volt system. Some, very few, use a 24 volt system.