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Soft Transformer Wire

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MagicSmoker:

--- Quote from: queennikki1972 on October 02, 2019, 01:16:44 pm ---120vac/24vac 75VA foot transformer 7" run of primary and secondary wires . flexible multi strand cable.

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Lots of different wires can be used as long as they are UL Approved for Class 2 transformers (which this kind is) and an "AWM" type (ie - appliance wire). See more about AWM here:

https://www.anixter.com/en_us/resources/literature/wire-wisdom/understanding-and-identifying-ul-awm-styles.html

The amperage on the primary is going to 75VA / 120VAC = 0.625A so go with #18 or #20 AWG wire - mainly for mechanical, rather than amperage, reasons - and the secondary will be 3.125A so #16 AWG will suffice here.

tooki:

--- Quote from: Kleinstein on October 02, 2019, 09:42:15 am ---For the transformer itself stranded wire is sometimes used for RF. This is than special litz wire with insulation. There is no need to use this for normal main's frequency.  Toroidal transformer for low voltage may sometimes use multiple thinner wires to avoid thick and very stiff wires that may not be compatible with the machines used. The choice there really depends on the details.

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Just to be clear, there is a (significant) mismatch between the German "Litze" and the English "litz wire".

German "Litze" is called "stranded wire" in English. In English, when we say "litz wire", it means specifically and exclusively the special stranded wire where each strand is insulated with enamel ("Hochfrequenzlitze" in German). We never, ever say "litz" to mean regular stranded wire.

See https://en.wikipedia.org/wiki/Litz_wire, https://de.wikipedia.org/wiki/Litze_(Elektrotechnik), and https://de.wikipedia.org/wiki/Hochfrequenzlitze



--- Quote from: queennikki1972 on October 02, 2019, 01:30:25 am ---Sometimes transformers come with soft flexible wire rather than rigid. What gauge is recommended for 120vac transformer primary side with say 24vac secondary of stranded wire and what is the soft flexible type of wire called? Links to it online would be helpful.

Modified ; I should say its used on foot transformers and is shielded cable.

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FYI, in English, "shielding" in electronics means shielding against EM interference. I'm pretty sure you mean insulation.

Zero999:

--- Quote from: queennikki1972 on October 02, 2019, 01:16:44 pm ---120vac/24vac 75VA foot transformer 7" run of primary and secondary wires . flexible multi strand cable.

--- End quote ---
The maximum secondary current will be 3.125A and the primary just over a fifth of that. In the UK mains flexible cables need to have conductors with a crossectional area of at least 0.5mm2, which is equivalent to 20 AWG, so use that for both the primary and secondary connections and you should be fine.

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