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Laws of Low Voltage

Know the Numbers. Own the Job.

Tired of guessing how far your wire can run—or how many fixtures a transformer can actually handle? Here's a quick-hit guide built for the jobsite.

 


Fixture Limits by Wire Gauge

  • #16-2 Wire → Max 15 LEDs96 vatios, or 8 amps
  • #12-2 Wire → Max 27 LEDs192 watts, or 16 amps

  • #10-2 Wire → Max 40 LEDs288 watts, or 24 amps

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LED Operating Voltage

Alliance LEDs have a wide range:
8V – 24V

 

BT module components run best between 10–14 volts. Too little voltage reduces communication range; too much can cause permanent damage.

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What Causes Voltage Drop? 

  • Length of wire
  • Lamp load
  • Line voltage from the transformer


Quick Planning: Wire Lengths 

Using #12-2 wire, how many watts can be on a wire run? 

Here's a rule of thumb:

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BT System Range

• BT Fixtures: 5–20 ft
• BT App Control: 10–30 ft
• BT Range Extenders: 35–75 ft



BTRE Placement Tips

• Start with 4: one in each corner of the job
• Make sure each BTRE sees 2 others (triangles of communication)
• Always keep a BTRE-5PK in the truck

 

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Transformer Fixture Limits

150W Transformer → ~15 fixtures
300W Transformer → ~30 fixtures
600W Transformer → ~60 fixtures

 

Fixture count depends on wire length, lamp wattage, and overall load

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Bottom Line:

When you know the rules, quoting is quicker, installs go smoother, and trust builds faster. 

If you want fewer problems and faster installs—stick to the numbers. This is how you build trust, avoid callbacks, and keep moving.