Knowledge Base & F.A.Q.
Choose from the topics below or use keywords in the search bar (top right) to find your answer.
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TransformersClick here to expand list
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Click here to hide list
- Can Semper Fi transformers be used to power low voltage lighting fixtures made by another company? View Answer
- What is the difference between an indoor and an outdoor transformer? View Answer
- What is the difference between a transformer, a power supply, and a driver? View Answer
- Are your transformers Magnetic? View Answer
- Are Semper Fi transformers Class 1 or Class 2 transformers? View Answer
- Can I use a Semper Fi transformer to power a three conductor installation (2 hot, 1 neutral conductors)? View Answer
- How do I connect a three conductor installation (2 hot, 1 neutral conductors)? View Answer
- I have 1200 Watts of 12 volt lighting. How do I wire this back to your 1200 Watt transformer? View Answer
- What is the difference between AC and DC voltage? View Answer
- What is low voltage lighting? View Answer
- What is the benefit of a standard Semper Fi multi-tapped transformer? View Answer
- What is the disadvantage of using integral transformers? View Answer
- Does using the taps impact the transformer's VA rating? View Answer
- What is the difference between an integral and remote transformer? View Answer
- How far away can a fixture be mounted from a standard transformer? View Answer
- Are transformers regulated or unregulated devices? View Answer
- Hello- What is the yellow and the black leads for on the 120 supply voltage side. Using a 12 vdc output transformer here to feed 12 vdc LED lighting. thank you View Answer
- What is the minimum load in watts for a 300 watt 120 volt to 12 volt 300 watt underground transformer to operate safely? We have always loaded the transformers to one third of capacity (300 watts = at least a 100 watt load) View Answer
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I need (1) remote surface mounted transformer for the following.
110 low voltage track fixture, 50 watt max; wired to (4) 20 amp circuits - if more are required, please quote accordingly. View Answer -
Do you also manufacture sized-to-the-load de-buzzing coils? We sourced a 1200w choke, but it had minimal effect on the transformer noise in the space - the connected load is only 300w.
Thank you!
View Answer -
How do I determine if the fixture is current or voltage driven? How do I select the correct Power Supply?
View Answer -
Please help me size/select a dimmable power supply for an exterior LED flood light application .
Each LED Module is rated for 10 Watts at 12 VAC (Power Factor = 0.8)
There are 5 Fixtures being controlled together
View Answer - What does "Full Wave Rectified VDC" Mean? View Answer
- The circuit breakers are tripping occasionally. What is wrong? View Answer
- Our System dims to about 5% and does not turn off. View Answer
- We ordered Model "S300", but received "R300" instead. Why is this different? View Answer
- Every two weeks for the last 2 years, a 12 volt incandescent lamp burns out. Voltage at lamp is 10.8 VAC typically. We called the fixture manufacturer and they said it was a transformer issue. How can we eliminate lamp failure? View Answer
- How does voltage drop impact LEDs (compared to low voltage incandescent)? View Answer
- Six MR16, 50watt, 12volt lamps on each cable/track. I have to reset using the rocker switch (low voltage circuit breaker on the Semper Fi transformer). One track trips after about 10 to 15 minutes. The other one trips after track been on for a day. Electrician was thinking the dust build up on the track could be causing the problem. View Answer
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Potting compound. Direct Burial transformers. What product do you recommend/supply for potting the wiring compartments.View Answer
- Are vaults included when ordering Direct Burial Vault (Model DBV) transformers? View Answer
- What color is the Direct Burial Vault cover? View Answer
- Can recessed transformers be surface mounted instead? View Answer
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I've attached a cut sheet for the fixture in question and the cut sheet of the LED lamp that will be used in it. We need a transformer that will dim to 1%. What is the best method?
View Answer - Our Dimmer is no longer working. There is 1000 Watt load. View Answer
- Will a transformer handle 120 and/or 277 volt input? View Answer
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Constant CurrentClick here to expand list
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Click here to hide list
- What is an "HM" breaker? View Answer
- What is the difference between AC and DC voltage? View Answer
- What is low voltage lighting? View Answer
- Does oversize wiring pay for itself? View Answer
- What is the minimum load in watts for a 300 watt 120 volt to 12 volt 300 watt underground transformer to operate safely? We have always loaded the transformers to one third of capacity (300 watts = at least a 100 watt load) View Answer
- How do I Power LEDs? View Answer
- What is the difference between constant current and constant voltage? View Answer
- How do I wire LEDs in Series? View Answer
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What does wiring LEDs in Parallel mean and is it recommended?
View Answer -
How do I determine if the fixture is current or voltage driven? How do I select the correct Power Supply?
View Answer -
Please help me size/select a dimmable power supply for an exterior LED flood light application .
Each LED Module is rated for 10 Watts at 12 VAC (Power Factor = 0.8)
There are 5 Fixtures being controlled together
View Answer - I am reading the following on an LED spec sheet. Under electrical, it reads "LED is 3W. 50,000 hour LED life, 700mA constant current Power Supply. LEDs must be wired in series." I want to select a driver to power 3 of the... View Answer
- Our System dims to about 5% and does not turn off. View Answer
- Do the RPK LED Drivers have a Minimum Load Requirement? View Answer
- How do I add LEDs to an existing installation? View Answer
- How does voltage drop impact LEDs (compared to low voltage incandescent)? View Answer
- How to Wire Several wire runs of LEDs using a Single Constant Current Driver? View Answer
- Six MR16, 50watt, 12volt lamps on each cable/track. I have to reset using the rocker switch (low voltage circuit breaker on the Semper Fi transformer). One track trips after about 10 to 15 minutes. The other one trips after track been on for a day. Electrician was thinking the dust build up on the track could be causing the problem. View Answer
- Regarding the LED steplights, would I include ?RPK? option in the model number if the customer wants a 120 VAC input? View Answer
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I've attached a cut sheet for the fixture in question and the cut sheet of the LED lamp that will be used in it. We need a transformer that will dim to 1%. What is the best method?
View Answer - Our Dimmer is no longer working. There is 1000 Watt load. View Answer
- What's the maximum distance using a remote Driver? View Answer
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Constant VoltageClick here to expand list
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Click here to hide list
- Do LEDs require the same transformer or power supply as low voltage incandescent lighting? View Answer
- How do I eliminate in-rush current? View Answer
- Are transformers regulated or unregulated devices? View Answer
- What is the minimum load in watts for a 300 watt 120 volt to 12 volt 300 watt underground transformer to operate safely? We have always loaded the transformers to one third of capacity (300 watts = at least a 100 watt load) View Answer
-
How do I determine if the fixture is current or voltage driven? How do I select the correct Power Supply?
View Answer -
Please help me size/select a dimmable power supply for an exterior LED flood light application .
Each LED Module is rated for 10 Watts at 12 VAC (Power Factor = 0.8)
There are 5 Fixtures being controlled together
View Answer - What does "Full Wave Rectified VDC" Mean? View Answer
- The circuit breakers are tripping occasionally. What is wrong? View Answer
- Our System dims to about 5% and does not turn off. View Answer
- Every two weeks for the last 2 years, a 12 volt incandescent lamp burns out. Voltage at lamp is 10.8 VAC typically. We called the fixture manufacturer and they said it was a transformer issue. How can we eliminate lamp failure? View Answer
- How does voltage drop impact LEDs (compared to low voltage incandescent)? View Answer
- Six MR16, 50watt, 12volt lamps on each cable/track. I have to reset using the rocker switch (low voltage circuit breaker on the Semper Fi transformer). One track trips after about 10 to 15 minutes. The other one trips after track been on for a day. Electrician was thinking the dust build up on the track could be causing the problem. View Answer
- Regarding the LED steplights, would I include ?RPK? option in the model number if the customer wants a 120 VAC input? View Answer
-
I've attached a cut sheet for the fixture in question and the cut sheet of the LED lamp that will be used in it. We need a transformer that will dim to 1%. What is the best method?
View Answer - Our Dimmer is no longer working. There is 1000 Watt load. View Answer
- What's the maximum distance using a remote Driver? View Answer
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ProductsClick here to expand list
-
Click here to hide list
- Can Semper Fi transformers be used to power low voltage lighting fixtures made by another company? View Answer
- Can I use a Semper Fi transformer to power a three conductor installation (2 hot, 1 neutral conductors)? View Answer
- What is an "HM" breaker? View Answer
- What is a "GFCI" breaker? View Answer
- I have 1200 Watts of 12 volt lighting. How do I wire this back to your 1200 Watt transformer? View Answer
- What is the difference between AC and DC voltage? View Answer
- What dimmer should I use with Semper Fi transformers? View Answer
- What dimmer should be used with the dimmer interface? View Answer
- What is low voltage lighting? View Answer
- What are the benefits of using low voltage lighting? View Answer
- Does oversize wiring pay for itself? View Answer
- Does stranded wire produce more voltage drop than solid wire? View Answer
- What is the benefit of a standard Semper Fi multi-tapped transformer? View Answer
- Does using the taps impact the transformer's VA rating? View Answer
- How far away can a fixture be mounted from a standard transformer? View Answer
- Are transformers regulated or unregulated devices? View Answer
- What is the minimum load in watts for a 300 watt 120 volt to 12 volt 300 watt underground transformer to operate safely? We have always loaded the transformers to one third of capacity (300 watts = at least a 100 watt load) View Answer
-
I need (1) remote surface mounted transformer for the following.
110 low voltage track fixture, 50 watt max; wired to (4) 20 amp circuits - if more are required, please quote accordingly. View Answer - How do I Power LEDs? View Answer
- What is the difference between constant current and constant voltage? View Answer
- How do I wire LEDs in Series? View Answer
-
What does wiring LEDs in Parallel mean and is it recommended?
View Answer -
Do you also manufacture sized-to-the-load de-buzzing coils? We sourced a 1200w choke, but it had minimal effect on the transformer noise in the space - the connected load is only 300w.
Thank you!
View Answer -
How do I determine if the fixture is current or voltage driven? How do I select the correct Power Supply?
View Answer -
Please help me size/select a dimmable power supply for an exterior LED flood light application .
Each LED Module is rated for 10 Watts at 12 VAC (Power Factor = 0.8)
There are 5 Fixtures being controlled together
View Answer - I am reading the following on an LED spec sheet. Under electrical, it reads "LED is 3W. 50,000 hour LED life, 700mA constant current Power Supply. LEDs must be wired in series." I want to select a driver to power 3 of the... View Answer
- What does "Full Wave Rectified VDC" Mean? View Answer
- The circuit breakers are tripping occasionally. What is wrong? View Answer
- Our System dims to about 5% and does not turn off. View Answer
- We ordered Model "S300", but received "R300" instead. Why is this different? View Answer
- Every two weeks for the last 2 years, a 12 volt incandescent lamp burns out. Voltage at lamp is 10.8 VAC typically. We called the fixture manufacturer and they said it was a transformer issue. How can we eliminate lamp failure? View Answer
- Do the RPK LED Drivers have a Minimum Load Requirement? View Answer
- How do I add LEDs to an existing installation? View Answer
- How does voltage drop impact LEDs (compared to low voltage incandescent)? View Answer
- How to Wire Several wire runs of LEDs using a Single Constant Current Driver? View Answer
- Model BVM calls out a single gang wiring box. Can a 4x4 wiring box be used instead? View Answer
- Six MR16, 50watt, 12volt lamps on each cable/track. I have to reset using the rocker switch (low voltage circuit breaker on the Semper Fi transformer). One track trips after about 10 to 15 minutes. The other one trips after track been on for a day. Electrician was thinking the dust build up on the track could be causing the problem. View Answer
-
Potting compound. Direct Burial transformers. What product do you recommend/supply for potting the wiring compartments.View Answer
-
I've attached a cut sheet for the fixture in question and the cut sheet of the LED lamp that will be used in it. We need a transformer that will dim to 1%. What is the best method?
View Answer - Our Dimmer is no longer working. There is 1000 Watt load. View Answer
- What's the maximum distance using a remote Driver? View Answer
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Power ModulesClick here to expand list
-
Click here to hide list
- What is the difference between a transformer, a power supply, and a driver? View Answer
- What is the minimum load in watts for a 300 watt 120 volt to 12 volt 300 watt underground transformer to operate safely? We have always loaded the transformers to one third of capacity (300 watts = at least a 100 watt load) View Answer
-
How do I determine if the fixture is current or voltage driven? How do I select the correct Power Supply?
View Answer -
Please help me size/select a dimmable power supply for an exterior LED flood light application .
Each LED Module is rated for 10 Watts at 12 VAC (Power Factor = 0.8)
There are 5 Fixtures being controlled together
View Answer - The circuit breakers are tripping occasionally. What is wrong? View Answer
- Our System dims to about 5% and does not turn off. View Answer
- Every two weeks for the last 2 years, a 12 volt incandescent lamp burns out. Voltage at lamp is 10.8 VAC typically. We called the fixture manufacturer and they said it was a transformer issue. How can we eliminate lamp failure? View Answer
- How does voltage drop impact LEDs (compared to low voltage incandescent)? View Answer
- Six MR16, 50watt, 12volt lamps on each cable/track. I have to reset using the rocker switch (low voltage circuit breaker on the Semper Fi transformer). One track trips after about 10 to 15 minutes. The other one trips after track been on for a day. Electrician was thinking the dust build up on the track could be causing the problem. View Answer
-
I've attached a cut sheet for the fixture in question and the cut sheet of the LED lamp that will be used in it. We need a transformer that will dim to 1%. What is the best method?
View Answer - Our Dimmer is no longer working. There is 1000 Watt load. View Answer
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-
LEDClick here to expand list
-
Click here to hide list
- Model BVM calls out a single gang wiring box. Can a 4x4 wiring box be used instead? View Answer
- Regarding the LED steplights, would I include ?RPK? option in the model number if the customer wants a 120 VAC input? View Answer
-
Potting compound. Direct Burial transformers. What product do you recommend/supply for potting the wiring compartments.View Answer
-
I've attached a cut sheet for the fixture in question and the cut sheet of the LED lamp that will be used in it. We need a transformer that will dim to 1%. What is the best method?
View Answer - Our Dimmer is no longer working. There is 1000 Watt load. View Answer
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Gemini One FiveClick here to expand list
-
Click here to hide list
- Model BVM calls out a single gang wiring box. Can a 4x4 wiring box be used instead? View Answer
- Regarding the LED steplights, would I include ?RPK? option in the model number if the customer wants a 120 VAC input? View Answer
-
Potting compound. Direct Burial transformers. What product do you recommend/supply for potting the wiring compartments.View Answer
- Our Dimmer is no longer working. There is 1000 Watt load. View Answer
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