Isolation Transformers

This video presents a thorough discussion of why isolation transformers are able to provide protection against shock hazards while working on electronic equipment, using transformerless amp circuits, and/or operating an oscilloscope. In the next video, we will build a basic, inexpensive isolation transformer.....so stay tuned.

CLARIFICATIONS:
1.) This video shows 120VAC (mains) circuitry. The general principles of ground referencing for 240VAC mains circuitry are basically the same.
2.) 35,000 VAC is a maximum for primary transmission. Normal primary voltage in residential areas is much lower.
3.) Words were clipped regarding out-of-phase receptacles in our homes........they are of no consequence.
4.) If all three of the secondary wires are utilized, the result is 240VAC, i.e. for ovens, home and water heaters, etc.
5.) Any circuit which is "earth ground referenced" (EGR) can be shorted to earth ground by test equipment, the human body, etc. The "horses" originate from the pole-mounted transformer and will gladly use any opportunity, or short cut to return to it. Once isolated from "mains" EGR, electrons have no affinity for earth ground and tend to remain, happily and safely, in their own circuit.
6.) The diagram showing a connection between ground and neutral/return in the receptacles is not literally true. The actual connection is made in the distribution panel (DP) of the structure, not in the receptacles. Since I did not cover the DP in the video, the connection had to be presented this way. In retrospect I should have mentioned this and used dotted lines in the diagram. I apologize for any confusion.

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