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What Downlight Transformers Are
A transformer changes (transforms) an alternating voltage from one value to another value, for instance from 240 volts to, say,12 volts.
A downlight transformer changes the mains voltage to a value that downlights use. |
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This webpage describes:
· What downlight transformers are.
· What downlight transformers do.
· What can go wrong with downlight transformers. |
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Downlight Transformers |
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Home > Advice – Domestic Electrical & Central Heating > Home Lighting > Downlight Transformers |
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What Downlight Transformers Do
A downlight transformer changes the input voltage, usually from the ring mains (UK 240 volts) to, typically, 12 volts.
The bulbs in downlights use a low voltage input.
‘Standard’ ceiling lights use, in the UK, 240 volts; 240 volts is too large for downlights, downlights are ‘low voltage’. The bulb in the downlight would blow if the input was 240 volts.
What Can Go Wrong With Downlight Transformers
· The transformer becomes unserviceable: · Replace the transformer – cost about £8 (UK).
· Part of the transformer becomes unserviceable: · There is usually more than one set of output connections – move the wiring to an unused pair of connections (remove power to the transformer first).
· Wiring deteriorates and becomes loose: · Remake the connections.
· Transformer overheats: · Can cause an intermittent problem, for instance flickering lights. · Transformers are mostly in the loft or ceiling space – something could be covering the transformer, for instance loft insulation. Remove what is covering the transformer to let the transformer cool down.
· Downlight does not work with a dimmer. · Cheap downlight transformers often don’t work with dimmers, buy a better quality downlight transformer.
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Links – Domestic Electrics & Central Heating Advice
Table and Floor Lamp Troubleshooting Tips
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