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Frequently Asked Questions
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| Series Transformers |
| 10. |
Q: |
I am designing some loops that will use fixtures that have 48W and 120W lamps and I am not sure what rating of isolating transformer to specify. The FAA L830 series transformers are only available in specific ratings, i.e. 45W, 65W, 100W, 200W, etc. Would you advise me to specify a 65W transformer for the 48W fixture, and a 200W for the 120W, so there is no chance of a transformer overload?
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A: |
In a word, no. The simplest case is the 48W fixture. An FAA L830-1 which is designated as a "45W", is actually verified at a load of 50W (there is some slack for cables lengths, lamp tolerances, etc.). So an L830-1 is more than adequate. If an L830-3 ( "65W") were used it would be less efficient, and the secondary current would be higher which could reduce lamp life. The 120W case is not as clear cut, but the answer is the same. An FAA L830-4 ("100W") is verified at 106W, which is less than the 120W load. However, real life transformers will stay within specification over a range, and for an Amerace L830-4, this range will cover 120W. Using an L830-6 ("200W") would result in lower efficiency, and likely shorter lamp life. |
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