low voltage lighting

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irelandnewyork

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Hi Guys, I have a low voltage question, if i have a 20a circuit that i want to use for low voltage lights, and the lamps are 50w does this mean that 5 lamps will pull 20a. ie 250w/12v = 20.83. Does this mean the low voltage track will be pulling 20a at the end of the run. Thanks in advance for the help Chris
 
The most you can have on any transformer supplying your LV track is 25 amps. Take a look at Article 411.
 
Typically you will not see a trany that is over 300 watts. 300/12= 25amps as Trevor stated above.

The 600 and 900 watt tranies are basically 2 or 3 300 watt transformer put together and a different circuit is needed for each.
 
By "end of the run" do you mean at the lights, or at the circuit breaker?

irelandnewyork said:
Does this mean the low voltage track will be pulling 20a at the end of the run. Thanks in advance for the help Chris
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The answer to that is no, if by "end of the run" you mean at the circuit breaker. The OP mentions that he has a 20A circuit, so my interpretation of the OP's concern is if this low voltage lighting load will trip the circuit breaker. So yes you have 20.83A at 12V, on the transformer side, however if this is fed from a 277V panel, 250W is only .9A at 277V, or 2.08A at 120V.
 
Sorry guys i meant that the track is 120v and the lights have built in transformers on them with 50w mr16 lamps in them so does each lamp pull 4.16a or .416a. I think its 50w/120v = .416 is this correct
 
irelandnewyork said:
Sorry guys i meant that the track is 120v and the lights have built in transformers on them with 50w mr16 lamps in them so does each lamp pull 4.16a or .416a. I think its 50w/120v = .416 is this correct
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That would get you close. There is some lose at the transformer also.
 
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