Replacing a Halogen Lighting Transformer
The Key to Transformer Power Supplies – Watts or VA – this is the load or the amount of watts that will be required for all of the lamps or bulbs that will be used or part of the light fixture(s) that will be connected to the power supply.
Understanding Lighting Transformer Power Supplies
Electrical Question: I have an old transformer that lights up small halogen bulbs in an above counter cabinet. Transformer went cold (compared to other two which remain warm went switch is on) and no longer powers 4 small 10Watt bulbs. I showed to lighting store only to be told the connections are too old (i.e. no one uses them). And, all 3 transformers plug into a strip and that single strip plugs into a normal outlet. See photo of the 4 connections to wiring for bulbs and single connection to go into strip. Basically, if all this is old, how do I convert to a new transformer? Or, better, can I buy a new transformer and attach the old connections to it at both ends (to bulbs and to the strip described earlier)? Ideally, there is a transformer out there that has 4 sets of ‘out’ wires that I could clip the old connections to and same goes for the other single end that connections to the strip. Thanks in advance
This electrical wiring question came from: Richard, a Homeowner from San Francisco, California.
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Thanks for your electrical wiring question Richard.
Halogen Lighting and Transformer Power Supplies
Skill Level: Beginner to Intermediate.
Tools Required: Basic Electricians Pouch Hand Tools, a non-aluminum ladder and Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and access to the light fixture(s).
Precaution: Identify the light circuit, turn it OFF and Tag it with a Note before working with the wiring.
Richard, copy down the specifications from the old transformer so that the new replacement power supply will be correct.
The Key to Transformer Power Supplies
- The specifications of a power supply will include :
- Primary Voltage – this is the main power of the lighting circuit, which is typically 120 volts in the USA.
- Secondary Voltage – this is the voltage that is required for the light fixture, and it will be AC or DC, this must be identified.
- Watts or VA – this is the load or the amount of watts that will be required for all of the lamps or bulbs that will be used or part of the light fixture(s) that will be connected to the power supply.
- IMPORTANT – Get the right power supply, and make sure it is rated so that it will supply the adequate amount of watts or VA for the light fixture(s).
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