is this wire suitable to wire led downlight transformers to mains lighting

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This cable is fine for wring the LED driver to the LEDs but not for wiring the driver to the mains supply. For that application it needs to rated for 240VAC and double insulated. Incidentally, the voltage stated in the specification doesn’t state AC or DC.  If it stated 300VAC it would withstand the voltage but fail on the double insulation. At the risk of telling you something you already know, 240VAC is an alternating voltage with a peak of 240 x 1.414 = 339V. The 240 in 240VAC is an RMS value defined like this: 240VAC has the same heating effect in a resistor as 240VDC but while the DC voltage stays constant at 240, the AC voltage alternates between +339 and -339. Apologies if you know all that already. Depending on the load, a suitable cable would be Merriway BHO1449 2-core Flat Flex 2192Y 0.5mm White.

ASIN	B07Y1V13HW
Best Sellers Rank	184,993 in DIY & Tools ( See Top 100 in DIY & Tools ) 920 in Electrical Wire
Brand	CARLITS
Colour	Red and Black
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (811)
Gauge	20.0
Manufacturer	CARLITS
Manufacturer Part Number	CARLITS-2PIN-20M
Material	Copper, Polyvinyl Chloride
Maximum Current	3.2 Amps
Number Of Wires	2
Number of Items	1
Strands	2
UPC	603470438535
Unit Count	20.0 meter
Voltage	300 Volts
Wire Diameter	0.5 Millimetres

20AWG 20M Extension Cable Electrical Wire 20 Gauge 2x0.5mm² Tinned Copper for Led Strips Single Colour 3528 5050

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