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Selecting the right sized low voltage lighting transformer for a low voltage lighting system can be a mystery for some electricians, interior designers or homeowners.

Just because you are installing a low voltage lighting system, it doesn’t mean you can use low voltage wire! In fact, low voltage current operates at higher amperage levels than standard 120 volt lighting systems.

The current is 10 times greater for a 12 volt system than for a 120 volt system with the same wattage. Consequently, you must use larger wire for 12 and 24 volt systems to minimize voltage drop and handle the increased amperage loads.

low voltage lighting transformer

All Phantom Classic low voltage lighting transformers come equipped with secondary circuit breakers or fuse protection which is sized to the capacity of the transformer. This is done as a safety precaution to prevent overload or short circuits from melting the wires or damaging the transformer.

To determine Phantom low voltage lighting transformers and wire requirements, calculate the total watts divided by the secondary voltage (12V or 24V) to obtain the amperage.

Total Watts / Secondary Voltage = Amperage

Phantom low voltage transformer part numbers, maximum wattage, and number of secondary fuses per transformer:

12 Volt Phantom Lighting Transformers:

MT102 – 100 watt transformer – (1) 10 amp fuse
MT152 – 150 watt transformer – (1) 15 amp fuse
MT252 – 250 watt transformer – (1) 25 amp fuse
MT502 – 500 watt transformer – (2) 25 amp fuses
MT752 – 750 watt transformer – (3) 25 amp fuses
MT1002 – 1000 watt transformer – (4) 25 amp fuse

24 Volt Phantom Lighting Transformers:

MT104 – 100 watt transformer – (1) 5 amp fuse
MT154 – 150 watt transformer – (1) 7 amp fuse
MT254 – 250 watt transformer – (1) 10 amp fuse
MT504 – 500 watt transformer – (1) 25 amp fuse
MT754 – 750 watt transformer – (2) 15 amp fuses
MT1004 – 1000 watt transformer – (2) 25 amp fuses

Wire Capacities For Copper Stranded Wire:

16 gauge – 10 amps
14 gauge – 15 amps
12 gauge – 20 amps
10 gauge – 30 amps
8 gauge – 40 amps

The experts at Phantom Lighting are more than happy to assist with a low voltage lighting transformer or load calculations. We stock a wide variety of low voltage lighting transformers that can be used a direct replacements for other lighting systems that operate at 12 or 24 volts.  In addition, we offer LED retrofit festoon lamps as a energy saving alternative to many inefficient incandescent or xenon festoon lighting systems.

Wiring and power distribution is the most important component of any low voltage lighting project. If you have any questions about our curio cabinet lighting systems or to get started on a lighting design plan for your antique furniture, contact Phantom toll-free at 800-863-1184 or request a quote using our online form. Or if you prefer, sign up for our monthly newsletter and we will keep you up-to-date on new product launches, resources, and more.

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