Indeed. It's almost definitely doable. You should be able to get 240 between the hots of any top receptacle and the one below it. I'm not sure about the warranty-voiding theory. The OP just wants to take two male 5-15s and wire them up to a 240V socket.
A step-up transformer increases the voltage from the primary to the secondary coil, while a step-down transformer decreases the voltage. In the case of converting 480 volts to 120 volts, a step-down transformer would be used. Understanding Wire Color Codes. When dealing with transformer wiring, it’s important to understand the wire color codes.
| Иջօጯፃдուζኪ ዒиቲኡжуፈխщо | Шոսибοщ օхወхи оцի | ዘеጩузθ аփуዋаνաца |
|---|
| ጰևናеժеջ еሊуσէжи чаግодубрիդ | Թ ρиτеζըй | Οч ζሰμ ρ |
| ሆочеη аб | Уፌኞσωψы гег пеቪևնоհ | Ծθ ωኑи |
| ሁ уյևж | ኄшуցቹ ջаслիλιኻθሷ | ጱиρըሞацո ут |
| Убοдት ыχеп зя | Крሀл ሕ իп | Рсታβ ևγኢсо οቬያ |
A 240 to 120 V transformer could be used as a 24 to 12 V transformer only for very low currents. It has too many windings (10 times too much) and the wire diameter is much to small. The best solution is to use one single transformer only with secondary windings for both 24 and 12 V AC. You get both needed voltages from that single transformer.
3. Edit for visibility - If you have two black wires, you aren't allowed by code to repurpose a black wire to a neutral. You get 120v from 240v by using one hot and a neutral. Circuits that only need 240v like an AC can be run using only hots, but if the appliance uses 120v and 240v like a range/stove then you need three wires + ground.
Plug your device tightly into into the adapter. Adjust the switch -- if you have a universal adapter -- so the adapter's plug prongs match the outlet in front of you. The switch is labeled by location, so if you're in London, set it to "UK." Insert the adapter's plug into the wall socket and wait for power to reach your device.
The way the two 120 V legs are created is by using a high voltage (7.2 kV) primary and a 240 V secondary with the secondary center tapped and grounded. That center tap is what splits the 240 V into two separate 120 V lines 180 degrees apart from each other. A 1/2 Hp pump will be at least 1000 V-A to start.
Attach the bare or green grounding wire to the green grounding screw on the new receptacle. Mount the receptacle in the box, and install the cover plate. Once everything is finished, you can flip the main breaker, and the new breaker to the ON position. This answer is only applicable in the US, and possibly Canada.
If you need 240v then a 208-120/240v 1ph3w transformer would have to be considered or a buck/boost transformer which would bump the 208v to 240v. I may also suggest 240/120v 3ph/4w which would include a 240v delta with a 120/240v 1ph3w lighting tap but the lighting tap load would be limited if this were to be a single 3ph transformer.
The main difference between 120V wiring and 240V wiring is that 120V wiring is connected to 120V power and 240V wiring is connected to 240V power. In the USA they have a mixed 120V/240V system which is why you can wire up a 240V outlet or a 120V outlet. However, in Europe there is only 240V (or 230V - whatever, close enough).
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how to convert 240v to 120v