C7P is a non-standard, polarised version of an IEC-C7 connector, only rated to 125V and usually sold with a US polarised NEMA connector on the other end of the lead ...
Check if it's 230V capable, as it may be 100-110V only and need a transformer. If so, a NEMA to C7P cable would work if the transformer has a NEMA socket.
£%201.68%21£%201.34%21%21%21%21%21%40211b5e2416811289199956768efa55%2112000015960355295%21btf&_t=pvid:3d36c4f6-fec4-46dd-93d6-8a422e927008&afTraceInfo=1005001405584434__pc__pcBridgePPC__xxxxxx__1681128920&spm=a2g0o.ppclist.product.mainProduct Tim
I checked around a lot of places and the upshot is this
The Tyros power supply will be 250V capable switched mode. The cable however never was and is not, but obviously its actually capable of doing the job. Piss poor engineering by Yamaha.
No one sells it with a UK plug. Aliexpress does it with a US plug that could be replaced.
The cable as described sounds familiar, I associate it with battery or shaver chargers, purchased in the US. All that I have in use now are bought in the UK, and have regular figure-of-8 form. I might still have one of the flattened ones in the spares box.
Why would it need to be polarised? There are three core versions of the connector around, Dell used to use them on the laptop chargers before they made the cables captive. Brian
According to Yung Li, their version of it is only UL approved - it doesn't have VDE or ENEC approval that it meets European standards (and also CJK+Taiwan approvals), which the unpolarised C7 has.
Which is probably down to it being only 125Vac rated. And also the NEMA plug on the other end not being approved.
As far as standards go, it doesn't meet BS EN IEC 60320-1:2021
As to what implication that has, depends on what you're doing. You might not get UKCA approval to sell a product using it, for example. If you want a law, try The Electrical Equipment (Safety) Regulations 2016:
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