11-02-2015, 11:36 AM
An isolation transformer galvanically isolates the earth connection from the supply. It should only supply the equipment being worked upon. Nothing elase should be connected.only one piece of equpment. If the set is an AC/DC model it will most likelly have a live chassis,it will be connected to both sides of the input supply,the result that if you come into contact with any of the circuitry, you will not receive a shock, or if you accidently put an eath to the chassis,will not cause a dead short.
You can connect either pole,Ie there is no L or N.
If you dont understand then you should learn more about basic theory.
An RCD feeding an isolating transformer is pointless,and will not provide any protection.
The poles from an isolation transformer will not be 120V to earth as has been suggested, but may be any voltage from 0-240v depending on leakage(capacitive) this residual voltage will not(or should not) supply any dangerous current to earth. The supply is known as a floating supply. Floating supplies are not allowed to feed any appliance or for any general supply (IEE regs) All supplies of electricity must be earthed. Thats why an isolating transformer only feeds one piece of apparatus only, which must not be connected to any earth.
Portable tools for outdoor use are feed from a 110v transformer, some people have called this an isolating transformer,however this is a double wound with a centre tap to earth, so that a shock from either side will be 55v
This is all basic electrical theory,if you dont understand leave well alone.!
You can connect either pole,Ie there is no L or N.
If you dont understand then you should learn more about basic theory.
An RCD feeding an isolating transformer is pointless,and will not provide any protection.
The poles from an isolation transformer will not be 120V to earth as has been suggested, but may be any voltage from 0-240v depending on leakage(capacitive) this residual voltage will not(or should not) supply any dangerous current to earth. The supply is known as a floating supply. Floating supplies are not allowed to feed any appliance or for any general supply (IEE regs) All supplies of electricity must be earthed. Thats why an isolating transformer only feeds one piece of apparatus only, which must not be connected to any earth.
Portable tools for outdoor use are feed from a 110v transformer, some people have called this an isolating transformer,however this is a double wound with a centre tap to earth, so that a shock from either side will be 55v
This is all basic electrical theory,if you dont understand leave well alone.!
