ChatterBank8 mins ago
12V transformer
6 Answers
I have just purchased some 12v halogen downlights with no wiring insructions. The transformer is maked L&N on the end with the 2 connections but none on the other end with the 3 connections
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On second thoughts it may be that the transformer has three output connections because it can be used to supply two differnt voltages (not at the same time). Obvioulsy one is 11.4v but my problem remains that I would then expect one of the others to be makred with a lower voltage, and the third to be the neutral connection.
Another point I fail to understand is why the imput is marked L and N. It makes no differnce which way round it is connected.
Another point I fail to understand is why the imput is marked L and N. It makes no differnce which way round it is connected.
Not convinced that Didwot answer fully explains it. Try this. The three outputs on the secondary side of the transformer are likely to be the two ends of the tapping and a centre tap. This should give 11.4V between each of the ends and the centre. Try measuring the output between terminal 1 and 2, and then try between 2 and 3 with an AC voltmeter. If I am right you will get about 15V AC in each case (because the transformer is under no load conditions). You will also get about 30V if you measure between terminal 1 and 3. Do this and report back, because I am not sure you have a transformer adequate for the job. The 0.75 comments almost certainly refer to the current capacity of the transformer - 0.75Amps maximum. So you may have a 24V 0.75A transformer with a centre tapping. If so, this is capable of driving one 20W halogen bulb. How many bulbs are you hoping to drive, and are they 20W or 50W types?
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