Eddy Current
Senior Member
Some of the people i worked with encountered a transformer that doesnt step up or down, whats the purpose?
Some of the people i worked with encountered a transformer that doesnt step up or down, whats the purpose?
There are only two reasons why I have ever speced/installed a 1:1 transformer (assuming you mean a power transformer)
480D\480grounded Y -- Establish a grounded Y system when the main power is Impedance grounded and some 277circuits are required. Generally a small xfm (75kva or so)
ice
I'm with the others here.Some of the people i worked with encountered a transformer that doesnt step up or down, whats the purpose?
I'm with the others here.
The purpose is electrical isolation.
In the UK, one use is for shaver sockets in bathrooms.
TBH, I don't know. Domestic/commercial isn't my field.In the UK, do they use these shaver sockets with isolation transformers in place of GFCI? Just curious.
As it happens, this on isolation transformers just dropped into my business email today:Some of the people i worked with encountered a transformer that doesnt step up or down, whats the purpose?
In the UK, do they use these shaver sockets with isolation transformers in place of GFCI? Just curious.
Thanks Adrian.Yes ..... and sorta no.
The only kind of outlet allowed in a bathroom is an isolated shaver outlet. This has a very low capacity, less than 30W, and provides a supply which is not earth referenced. The idea being, that since the shaver supply has no connection to earth, a shock between live & earth is not possible.
In Uk terminology the equivalent device to a GFCI is an RCD (Residual Current Device). General purpose socket outlets are not allowed in bathrooms, even if protected by an RCD.
RCD's are common (and under the 17th edition of our wiring regulations, compulsory) for socket outlet circuits & are usually rated at 30mA
Adrian
Yes ..... and sorta no.
The only kind of outlet allowed in a bathroom is an isolated shaver outlet. This has a very low capacity, less than 30W, and provides a supply which is not earth referenced. The idea being, that since the shaver supply has no connection to earth, a shock between live & earth is not possible.
In Uk terminology the equivalent device to a GFCI is an RCD (Residual Current Device). General purpose socket outlets are not allowed in bathrooms, even if protected by an RCD.
RCD's are common (and under the 17th edition of our wiring regulations, compulsory) for socket outlet circuits & are usually rated at 30mA
Adrian