I am the proud owner of a device advertised as:
The transformer has a mass of leads and the markings on the transformer are not at all helpful in determining how to connect it.
So what I did was attach an AC source (6.3VAC, but it actually measured 7.06VAC on my meter) to various combinations of taps and found the following:
questions:

Code:
Device: 12A 12101604
* AC Voltage Taps 204V,210V,216V,221V,240V
Size(LBHmm):120 x 120 x 45
Mounted on a base plate
Weight: 4.2kg
** Note these Transformers are
new and un-used but have been
pulled out of equipment.
The transformer has a mass of leads and the markings on the transformer are not at all helpful in determining how to connect it.
So what I did was attach an AC source (6.3VAC, but it actually measured 7.06VAC on my meter) to various combinations of taps and found the following:
- There are 2 separate windings.
- One winding, with 7.06VAC across red and grey, reads (wrt red) red=0V, brown=3.95V, yellow=4.68V, blue=5.87V, and grey=7.06V
- The other winding (black and white) is separate and measures 40.5VAC.
- There are two grey wires.
- There are two black wires
- There are an additional 2 thinner red wires
- There are an additional 2 thinner black wires
- All wires of the same colour appear to be connected together.
- The thick wires are labelled as 750VAC
questions:
- Is it an autotransformer?
- If not, what is the secondary voltage (assume primary is 240V)?
- If so, how should it be connected?
- The voltages above are how I measured it.
- Murphy's law applies.


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