Wednesday, December 28, 2011

Flyback Transformer

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Wednesday, December 21, 2011

Lighting a Fine Craft Trade Show Booth - Options for the Budget-Conscious Artist

!: Lighting a Fine Craft Trade Show Booth - Options for the Budget-Conscious Artist

Good lighting is a main ingredient of a successful trade-show booth. Just the right lighting system can help an artist create the atmosphere of a fine-craft gallery. This will lure gallery owners off the isles and into your booth – the first step toward making a sale.

Lighting is a relatively expensive investment. So how does the budget-conscious artist find the right solution?

When it comes to choosing a lighting system, artists new to the trade show circuit often become overwhelmed. Prices vary wildly, and each convention center may have its own lighting rules. Lighting technology is changing rapidly, making the choices harder still.

This article details what I learned while tackling the challenge of lighting my 10’X10’ booth at the American Craft Retailers Expo (ACRE), a large wholesale show for American and Canadian craft artists. As I am new to trade shows, this information is meant only as a pointer for artists in the process of choosing lighting, and perhaps also for more seasoned artists looking to update their systems.

In examining many different lighting options, my objective was to illuminate my glass jewelry beautifully but inexpensively. I wanted the lights to be lightweight and modular, to fit in boxes for shipping to the show. I was looking for contemporary styling, in silver or black. And I wanted to have at least one special lighting effect – not too flashy – to give my booth a unique element.

In his CD on booth design, art business consultant Bruce Baker suggests 1,000 watts will light up a 10’X10’ booth very effectively. I decided to stay at or under 500 watts, however, because the ACRE show includes 500 watts with the booth price, and the halogen lighting I ultimately decided upon illuminates my displays very well. Since I bought the lights at a “big-box” store with sites in virtually every city in the U.S., I can add more lights once I’m at the trade show if necessary.

The Battle of the Bulb

Contractors Choice Lighting (www.ccl-light.com) says a light fixture is simply a “bulb holder.” The bulb, therefore, should drive one’s choice of a fixture. This is somewhat true for trade-show lighting, although the fixtures may dictate the types of bulbs, depending on the choices available at the store where one shops for the lights. The CCL website offers a “Bulb Photometrics” page ([http://ccl-light.com/photometrics.html]), whose graphical representation is a refreshing departure from the complex descriptions of lighting options that have proliferated on the web.

Halogen is the bulb of choice for many trade show exhibitors. It offers a crisp, white light. Although people commonly refer to halogen as non-incandescent, it is in fact a kind of incandescent lamp. It generates light by using a thin filament wire made of tungsten, heated to white by passing an electric current through it. According to General Electric, the first halogen lamp was developed in 1959 – not too long ago for many of us!

Halogen bulbs differ significantly from the traditional type of incandescents we grew up with. The halogen bulb’s filament is surrounded by halogen gases (iodine or bromine, specifically). These gases let the filaments operate at higher temperatures. The end result is a higher light output per watt.

The gases also do something rather miraculous: Tungsten tends to evaporate off the filament over time, and the gases actually help re-deposit the tungsten onto the filament. This extends the bulb’s life way beyond that of the traditional incandescent bulb, whose evaporated tungsten clings to the walls of the bulb like a smoky apparition and eventually the uncoated filament snaps. Who hasn’t rattled a burnt-out light bulb and enjoyed the jazzy cymbal sound of the broken filament inside?

In addition to giving off more light than traditional incandescent bulbs, halogen bulbs emit a whiter light that provides better color rendition. “For highlighting and bringing out true colors, use halogen lamps,” suggests USA Light and Electric’s website (www.usalight.com). “Nothing looks better than the drama brought in with halogen lamps.”

Baker also suggests halogen lights – floodlights in particular – for a contemporary look, especially for jewelry and glass. It’s important to consider that other fine craft materials such as ceramics and wood might be better enhanced with halogen spotlights, or even with some of the more traditional incandescent lights that emit a warmer color.

Having decided upon halogen lighting, my next task would be to choose bulbs. The ACRE show takes place at the Las Vegas Convention Center, which has instituted a strict halogen lighting policy. Each light cannot exceed 75 watts, and all halogen bulbs must be factory sealed in glass (not in a removable lens or linear shape).

Thankfully, there is plenty of factory-sealed halogen lighting, in the form of PAR halogen bulbs. PAR is an acronym for “parabolic aluminized reflector.” PAR bulbs have a built-in reflecting surface made of pressed glass. The glass provides both an internal reflector and prisms in the lens for control of the light beam.

PAR bulbs are numbered, as in PAR 16, PAR 20, PAR 56. The PAR number refers to the bulb shape. Bulbs.com has a halogen section of the site where you can quickly compare the various PAR bulbs visually. Within a given category of PAR bulbs there are various wattages, wide and narrow spotlights and floodlights, different base sizes, and even different colors.

Fortunately I was able to skip the process of deciding on a PAR bulb by deciding first where to shop for my lights (more on that below).

Power Issues

When you go to shop for track lights, you’ll notice there’s a choice between 12-volt and 120-volt fixtures. 120 is the standard voltage that comes directly into most homes and offices – and convention centers.

For a lamp using 120 volts, no additional parts are necessary beyond a regular socket. 120-volt fixtures generally are lighter than 12-volt fixtures because they don’t need a transformer. They also cost less and can use halogen or regular incandescent bulbs.

I stopped short of investigating 12-volt fixtures, except to find out that they step down the amount of energy being used to a lower voltage, and thus are more energy efficient. They require a transformer to convert the 120-volt household current to 12 volts, and they may require hardwiring (although one artist I know found a 12-volt fixture with a built-in transformer which she was able to plug into a 120-volt outlet. A 12-volt fixture accommodates very efficient bulbs that offer a variety of wattages and beam spreads, including the 50-watt MR-16, which is popular in galleries.

I decided on 120-volt lighting for the trade show, because I wouldn’t have to worry about transformers and could just plug it in.

Choosing a Store and Track Lighting

I read the ACRE online forum for clues about where to buy lighting. What one artist said struck me as eminently sensible: He buys all his lighting at Home Depot, because if anything goes wrong at the show, he can find a store nearby for replacement parts.

This was something to consider: Tempting as the gorgeous designs might be, special-order lighting of any kind introduces the risk of having a malfunctioning light for the duration of a show.

Another artist on the ACRE online forum said he buys his lights from Lowes. It probably doesn’t matter which big-box store one chooses, as long as there’s one in every city.

Since I was new to trade shows and this was to be my first lighting kit, I resisted choosing from the many good suppliers on the web. I settled on the limited but attractive selection at Lowes. A side benefit of this was that my choices were comfortably narrowed.

Within the category of halogen lighting, you can get either track lights or stem-mounted lights (with arms extending outward). I went with track lights. This was partly because the stem lights I found on the web were relatively expensive and Lowe's didn’t offer them, and partly because with track lights I could have one cord instead of several hanging down.

The Lowes lighting salesperson was helpful in putting together a full package from the track lighting on display and in stock. I decided on four, two-foot tracks to keep the size of my shipping boxes down. Here’s a rundown of what I bought:

· 4 two-foot track sections, Portfolio brand, black finish, Item #225678. Each section holds 2 lights, for a total of 8. Total: .12

· 8 Flared Gimbal Track Lights, Portfolio brand, Item #120673, with a satin chrome finish for a contemporary look. They are easy to attach to the track by following the directions. Total: .76

· 8 halogen bulbs, Par 20, 50-watt, for bright, crisp light. I bought several floodlights and a couple of spotlights. The bulbs are very packable, at a little over 3” long and 2.5” in diameter. Total: .00

· 2 Miniature Straight Connectors by Portfolio, Item #120716, for joining two of the track sections end to end. The idea is to have only one cord to plug in from a row of four lights. Total: .92.

· 2 Cord and Plug Sets, Portfolio brand, Item #120827, to power track from a standard AC wall outlet. I connected these to the end of the two of the track sections by unscrewing the covering on one side of the track. Total: .06

· Various Multi-Purpose Ties (cable ties), by Catamount, for attaching tracks to booth pipes. Total: .00

· 2 heavy-duty extension cord/power strips – 14-gauge, 15-feet, with three outlets each, Woods brand, from Lowe’s, Item #170224, model 82965. Total: .00

Grand total: 3.86

The Gimbal lights I chose only accept a 50-watt, PAR 20 bulb, which made it easy to pick out the bulbs. So in this case, the fixture drove the choice of bulb, not the other way around.

According to the Bulb Photometrics page at Contractors Choice Lighting, a PAR 20, 50-watt halogen flood bulb will emit a beam of light with a 5’4” diameter when it reaches 10 feet away. It offers about 12 foot-candles worth of light at 10 feet away from the bulb (a foot-candle is the level of illumination on a surface one foot away from a standard candle.)

For the sake of comparison, a PAR 30 beam offers a diameter of more than 8’ at 10 feet away, and you still get about 14 foot-candles at that distance. What happens if you notch it up to a 75-watt bulb? You get a lot more foot-candles (38) at 10 feet away. This suggests that larger trade-show booths might want to take advantage of higher PAR and higher watt bulbs.

All together, the track lighting system I chose uses 400 watts of electricity. This left me another 100 watts to add specialty or accent lighting to my booth, while still remaining at the 500-watt limit.

Cords, Plugs and Hanging Lights

The Las Vegas Convention Center has very strict rules for cords, plugs, and hanging lights.

The two-pronged, 18-gauge cords that the manufacturer has attached to your lights are acceptable (leave the UL tags and labels intact). These lighting cords cannot be plugged into the convention center outlet, however. Instead, you must plug them into a three-pronged, heavy duty, 14-gauge extension cord – or a breaker strip with a 14-gauge cord. You can then plug that 14-gauge extension cord into the convention center outlet.

A 14-gauge extension cord is capable of handling 1,825 watts. It’s helpful to read the brief extension-cord sizing and safety information on the web pages of the Underwriters Laboratories (www.ul.com/consumers/cords.html) and the University of Florida Cooperative Extension Service ([http://edis.ifas.ufl.edu/FY800]) before purchasing a cord.

Bruce Baker suggests the cord be 20 feet with six outlets, and that it include a cord reel. I couldn’t find this type of cord at Lowe’s, so I decided on two 15-foot, heavy-duty, 14-gauge extension cord/power strips, each offering three outlets. If you have a larger booth, you can find a 25-foot cord with three outlets at Lowe’s.

There are so many different approaches to hanging lights, and so many variables to consider, that it could be a topic for another article. In general, you can hang or clip lights onto a cross bar or onto the “hard walls” of your display if you have them. Depending on the rules of a particular trade show and the size your lighting system, you may be permitted to attach the lights to the booth’s existing pipe and drape.

Since my booth design does not include my own walls, my lights will attach either to the existing pipe or to a cross bar. Cable ties (commonly called “zip ties”) appear to be tool of choice for attaching tracks to the pipes or bars, and even for attaching additional cross bars to existing pipe and drape. One artist I know uses Velcro strips, followed by cable ties to secure the attachments. There are a few entire websites for cable ties. One of them is http://www.cabletiesplus.com .

I purchased Multi-Purpose Ties from Home Depot. They can bundle 4 inches in diameter, withstand temperatures up to 185 degrees Fahrenheit, and hold up to 50 lbs.

Accent Lighting: LEDs

There are many ideas for accent lighting – although a fair treatment of the topic is beyond the scope of this article. Light-emitting diode (LED) lighting is one technology that is experiencing breakthroughs and growing fast. It takes many LEDs to equal the light output of a 50-watt bulb, and LEDs are fairly expensive, so LEDs aren’t ready for prime time when it comes to lighting a whole booth.

There are several close-up applications for LEDs, however, that are worth looking into now. An example is the in-counter light bar sold by MK Digital Direct at http://www.mkdigitaldirect.com (at a whopping 5 per foot). The more affordable MK Sparkle Light Pocket () is a portable device that has extra long-life of over 100,000 continuous hours and promises to give jewelry “maximum sparkle and scintillation.”

The Nexus mini LED light system (www.ccl-light.com), meanwhile, offers a lot of illumination for its size – a puck shape not much bigger than a quarter. The company says it is for direct display lighting of crystal and glass, and it can even be submerged in water. The light is attached to a 12’ cable that ends in a plug, and has “mode switch” with seven different color choices. Unfortunately, white is not one of the color choices, and at it’s a bit expensive. Still, a few of these lights combined with room lighting could draw viewers into your booth and toward your most dramatic displays.

LEDS also include tube lights, flexible lights, linear lights, and bulbs. Superbright LEDs (www.superbrightleds.com/edison.html ) has a collection of 120-volt screw-in LED bulbs for accent and other low-lighting applications, as well as a host of other fascinating products such as “plant up-light fixtures.”

At this writing, the search was still on for accent lighting to give my booth an extra special glow. Stay tuned for a future article on the results.

Online Resources

The following list is not an endorsement, but rather a starting point for research on lighting systems, cable ties, and accent lighting.

http://www.ccl-light.com - inexpensive and many choices, has “Bulb Photometrics” page to help determine how much light and what kind you want from a bulb

http://www.direct-lighting.com - stem-mounted and track lights

http://www.usalight.com - large selection of lighting and bulbs

http://www.bulbs.com - quick visual comparison of PAR bulbs (in halogen section)

http://www.cabletiesplus.com - Cable (zip) ties for securing track lights to pipe

http://www.mkdigitaldirect.com - LED lights for jewelry cases

http://www.american-image.com/products/lights/lights.html - a nice selection and visual layout of stem-mounted and other lighting (but not cheap)

http://www.brightmandesign.com/products/wash-super.html - good technical information and images of lights set-ups for trade shows; several stem-mounted clip-on designs

http://www.superbrightleds.com - LED accent lighting, including screw-in bulbs and light bars


Lighting a Fine Craft Trade Show Booth - Options for the Budget-Conscious Artist

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Sunday, December 11, 2011

Deck Step Lighting - Made Easy With Outdoor Solar Lights

!: Deck Step Lighting - Made Easy With Outdoor Solar Lights

Recent changes to construction code requires the illumination of deck steps. This is a challenge for contractors and homeowners that are installing a new deck.

What once was strictly a carpenter's affair now requires wiring, electrical connections prone to failure, expensive transformers perhaps even an electrician and local building permit. Wires and transformers and permits Oh My!

All exterior stairways shall be provided with a light source located near the top landing of the stairway. IRC 303.6

For the contractor the issues include a longer project timeline. Worse they now run the risk of increased "call backs". Wired lights are prone to failure when electrical connections corrode. Low voltage systems are also notorious for transformer failures. Worried about not receiving that last payment from the homeowner, the contractor now has to worry about product failure. Product failure was never a concern for the deck contractor when the project used to be comprised of just wood and fasteners - no more.

For the homeowner, wired deck lights add to the cost of a deck installation (whether they know it or whether the cost is hidden in the total project cost). The wired lighting systems have multiple failure points i.e. connections, bulbs and transformers. Many systems also require a manual process to "switch on" / "switch off". Ever forget to turn lights off in a room? Trust me, you will forget to turn your deck lights on too.

The easy solution for both contractors and homeowners is Solar Deck Lights - here's why.

Easy Installation

Some of the solar lights can be installed by simply drilling a hole with a spade drill and inserting the light. That's it done. The solar light is fully contained and encapsulated. Nothing to wire - no wires!

No Wires

The inherent design of solar lights makes them fully independent. The best lights are fully encapsulated and waterproof (look for IP67 or better). Not only does the lack of wires improve installation but you've also eliminated a major failure point.

Auto ON Auto Off

Solar lights store energy during the day and light up at night. Their internal circuitry constantly monitors the amount of lumens or sunlight that hits the solar cell on top of the light. When the sun goes down the light goes on. There it is! You never have to remember to turn "those deck lights" on or get up late at night to turn them off.

Long Life

Solar lights utilize LED lights which last well over 25,000 years. In fact they last so long that deck light manufactures make no provisions to allow the consumer to change them. If they essentially never burn out why take unnecessary design steps to allow for their replacement - or so the thinking goes.

Beautiful Ambient Light

The best part! Sit back and enjoy the glow.


Deck Step Lighting - Made Easy With Outdoor Solar Lights

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Monday, November 28, 2011

The Basics of Low Voltage Landscape Lighting Transformers and Other Landscape Lighting Tools

!: The Basics of Low Voltage Landscape Lighting Transformers and Other Landscape Lighting Tools

When you are planning to embark on either a small-scale or big scale landscape lighting project, it is very important to know about voltage fluctuations and low voltage landscape lighting transformer. These things are essential in a successful landscape lights design and will help you transform your garden or yard into a thing of beauty.

Landscape lighting, for the past few years, have seen an immense increase in popularity. More and more homeowners are realizing the benefits of investing in a lighting design instead of putting all their money of landscape design alone. With proper lighting, they can highlight features of their garden that they wish to stand out and hide those they wish people won't notice as much.

With the popularity of landscape lighting, it is therefore not at all surprising how both users and homeowners are starting to check out low voltage landscape lighting transformers and other tools in order to help them decide and implement their lighting projects. There are quite a number of components and systems to check out and one of the most important part is the transformer.

The transformer is very important when embarking on a lighting project. If you want to install lighting fixtures in your garden or yard and design it so that it requires a constant flow of current, you need to have a current transformer that will measure the electrical current that comes into the device and distribute it to whatever lighting fixture that is connected to it.

A transformer is very important since is proportionally sends out either the alternating current or the alternating voltage that prevents the lights and the landscape lighting system in general to flicker. Unnecessary and unwanted flickering of landscape lights is one of the most common problems in landscape lighting and you can prevent this from happening using a reliable transformer.

Another need that requires a current transformer is to determine cases where there might be a circuit overload, a power surge, a ground fault or basically to just keep harmful current feedback at bay.

When shopping for a current, make sure that you know the technical specifications of your project since the right current transformer needs to know the total load that is required for the device to carry, the electrical output of the transformer, and many others. If you are not quite sure what transformer to buy, it's best to consult an expert or a professional electrician for advice.


The Basics of Low Voltage Landscape Lighting Transformers and Other Landscape Lighting Tools

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Tuesday, November 8, 2011

Class of Protection in Electrical Appliances

!: Class of Protection in Electrical Appliances

All electrical appliances using mains voltage have to provide at least 2 levels of protection to the user. This is to ensure that if one of the protection layers were to fail, there is the back-up of the second layer still in place. This makes electrical equipment very safe to use. Appliances can be Class 1 or Class 2.

When PAT testing, it is important to first identify the Class of the appliance as Class 1 appliances are tested differently from Class 2 appliances.

Depending on how exactly the protection is provided, electrical appliance are put into 5 Classes of equipment construction which are Class 1, 2, 3, 0, 01. Of these the most important are Class 1 & 2. For completeness all the Classes are described below.

CLASS 1

Here the protection is provided by a combination of insulation and use of the mains Earth. It is best shown by referring to an electric fire that has been taken apart.

In the open plug the three wires connecting to the LIVE, NEUTRAL and EARTH pins. Inside the fire, the brown LIVE wire and the blue NEUTRAL wire connect to a plastic connector. The green/yellow Earth wire connects to the metal case of the fire.

The user is protected from electric shock by the plastic insulation of the connector. This holds the LIVE and NEUTRAL wires in place and prevents them from touching the metal case of this electric fire. This plastic insulation of the connector is known as basic insulation.

If this basic insulation were to fail, say due to excessive movement of the cable where it touches the metal case then the user of the fire can receive an electric shock if not for the fact that the EARTH wire is present.

By connecting to the metal case of the electric fire, the EARTH wire keeps all this metal at EARTH potential. What this means is that it is impossible to get an electric shock even when the metal case of the fire is connected directly to the LIVE voltage. In practice a fuse would blow either in the plug or the main fuse box to protect the user.

In summary, in Class 1 appliances the user is protected by a combination of basic insulation and the provision of an EARTH connection, thus providing two levels of protection.

When PAT Testing Class 1 appliances, the Earth Continuity and Insulation Resistance tests are carried out.

CLASS 2

In a Class 2 appliance, the user is protected by at least two layers of insulation. For this reason, Class 2 appliances are also known as Double Insulated. They do not require an Earth connection.

This is best shown by looking inside a Class 2 electric drill which has been opened up. Inside one can see that as well as the plastic connector providing basic insulation, there is additional insulation provided by the plastic enclosure of the drill.

The user is therefore protected by two separate layers of insulation. When PAT testing Class 2 appliances, just the Insulation Resistance test is carried out.

Class 2 appliances are always indicated by the double box symbol on the rating plate.

CLASS 3

Equipment built to Class 3 standard are designed to be supplied from a special safety isolating transformer whose output is known as Safety Extra-Low Voltage or SELV. This must not exceed 50 V AC and is normally is below 24V or 12V. All Class 3 appliances are marked by a special symbol. There is no use of an Earth in Class III appliance

The electrical safety of Class 3 appliances are taken care of in the safety isolating transformer design where the separation between the windings is equivalent to double insulation. The transformer is marked as being suitable for use with Class III appliances.

CLASS 0 & 01

This type of equipment is not for normal use in business or residential environments. It is just presented here for completeness.

Class 0 appliances depend only on basic insulation for protection from electric shock. For this reason, they do not have 2 levels of protection built in and are not allowed for sale. The brass lamp shown here is an example of a two wire, metal cased appliance with only basic insulation. There is no provision for connection of an earth to the bulb holder.

In Class 01 appliances, there is provision for an Earth connection, but it is wired with either twin core cable or only has a 2-pin plug, so an Earth cannot be connected. AS in Class 0 equipment, one is dependent only on basic insulation for protection from electric shock. As they only have 1 level of protection, Class 01 appliances are not allowed for sale.

If during PAT testing one comes across a Class 0 or Class 01 appliance these can be failed.

IDENTIFYING CLASS I & CLASS II APPLIANCE

As the PAT testing carried on Class 1 and Class 2 appliances differ, it is important to identify one from the other. There is no other area of PAT testing that causes more confusion than this and there are many myths surrounding this. It will be informative to list some of these.

If there is a fuse in the plug, then it must be Class 1.

It is made of metal so it must be Class 1

The case is plastic so it must be Class 2

It has a three core cable so it must be Class 1

The plug has a metal Earth pin so it must be Class 1

None of the above statements is a fool-proof way to identify Class I and Class II appliances and some are quite misleading.

The easiest rule to apply is the one below.

If the rating plate has a double box then the appliance is Class 2. If it does not then it is Class 1.

Example - Kettle

The rating plate on this kettle clearly has no "double-box" symbol, so using our rule, it must be Class 1. The Earth connection from the plug is terminated on the outside metal casing of the heating element. When PAT testing this kettle the Earth Continuity and Insulation Resistance test has to be carried out.

Example - Plug-top power supply

The rating plate on this Plug-top transformer clearly shows the "double box" symbol, so this is a Class 2 appliance. Note that it has a plastic Earth pin, as this is not required for Class II. (Not all Class 2 appliances have a plastic earth pin). Just the Insulation Resistance test has to be carried out during PAT testing.

Example - Mains extension

The rating plate on this extension is moulded in the plastic. It clearly does not have a "double-box" symbol, so it must be a Class 1. When PAT testing this extension lead the Earth Continuity and Insulation Resistance test has to be carried out.

Example - Table lamp

The rating plate on this table lamp clearly shows the "double-box" so it is a Class 2 appliance. (Note that this is a Class 2 appliance that is largely in a metal enclosure). The bulb holder is made of plastic and provides the required double insulation. Just the Insulation Resistance test has to be carried out during PAT testing.

Example - Desk fan

The rating plate for this fan not only does not have a "double-box" symbol, it also says that the appliance must be earthed. So this is clearly a Class 1 appliance. Note that it does not have any user accessible metal.

Example - Metal Lamp

If this metal lamp had a rating plate, then it would be a Class 1 appliance as it has an earth point on the lamp holder. However, as the rating plate is missing, this would have to be failed.

Are Class 1 and Class 2 appliances just as safe?

As both have 2 levels of protection built in, they are both safe for general use.

However with Class 1 an appliance, one of the layers of safety is provided by the earth connection. For this to be effective, the wiring in the building has to be inspected regularly to check that the Earth in the mains socket is correctly taken to the local earth potential. This is usually picked off the Earth sheathing of the mains cable coming into the premises, or by driving a local stake into the ground. So Class 1 appliances depend on the external wiring in the building to fully provide the 2 levels of protection.

Class 2 appliances however always provide 2 levels of protection irrespective of the status of the wiring installation. Both layers of protection are built into the design making Class 2 appliances are a lot safer than Class 1 appliances.


Class of Protection in Electrical Appliances

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Friday, November 4, 2011

Low Voltage Transformer - Top 4 Buying Tips

!: Low Voltage Transformer - Top 4 Buying Tips

Transformers that convert mains voltage to lower voltages are much used items - especially in low voltage lighting. There is an incredible amount of makes and models to choose from, when shopping for a transformer, so I want to give you a few tips to take with you:

1 - Make sure the transformer outputs the low voltage you need. A very common type is the 12v transformer (one that outputs 12v) but many others voltages are available. You won't do any damage if the voltage is lower than required for your purpose, but but it might not work very well. On the other hand, if you feed 24v to something that needs 12v, you might damage the electronics severely, so this is something to get right.

2 - Know the power rating of what you want to power. If it is halogen light bulbs, figure out how many watts are consumed by each bulb and multiply that with the number of bulbs you will be using. That is the minimum power rating of the transformer you need. A good rule of thumb is to have a little headroom in the power, meaning that you might have at least 50% more power available from the transformer than you think you need. If your light bulbs consume 100 watts, then get a 150 watt transformer at the very least. Yo never know if someone in the future will put more power hungry bulbs in the system, without taking the capabilities of the transformer into consideration.

3 - Be sure on what kind of voltage you need - AC or DC? A transformer alone can only output AC voltage, so if you need DC, what you really want is actually what is called a power supply. This is a transformer plus some extra electronics. Also, do you need bipolar or unipolar outputs? A bipolar transformer has three output pins, which are called the positive, the negative and common (ground). A unipolar transformer only has the positive and the common - this type is what is normally sold as a low voltage lighting transformer, among other things.

4 - Also, if you want to be able the dim your low lights, you should know that you need to look specifically for a dimmable low voltage transformer, as not all types will allow this.

Finally I just want to say a bit about safety when working with electrical installations. The best thing is of course to get a trained electrician or technician to install your transformer, but a lot of people have done it themselves with success. - except for one thing: The actual connection of the transformer to mains voltage should definitely be done by a professional. Mains voltages are lethal, so stick to working with the parts that carry low voltages and you should be fine.


Low Voltage Transformer - Top 4 Buying Tips

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Friday, October 28, 2011

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Sunday, October 23, 2011

Power Bright VC3000W Voltage Transformer 3000 Watt Step Up/Down 110 Volt - 220 Volt

!: Saved Power Bright VC3000W Voltage Transformer 3000 Watt Step Up/Down 110 Volt - 220 Volt buy online

Brand : Power Bright | Rate : | Price : $89.95
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3000 Watt Voltage Transformer (VC3000W) This voltage converter can be used in 110 volt countries and 220 volt countries. It will convert from 220-240 volt to 110-120 volt AND from 110-120 volt to 220-240 volt.

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Monday, April 18, 2011

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Tuesday, April 5, 2011

100 Watt, 200 Watt , 300 Watt Transformers 200 watt Transformer - BKM41

!: The Top 10 Places to Buy 100 Watt, 200 Watt , 300 Watt Transformers 200 watt Transformer - BKM41 ideas

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Connects up to four Alpine lights or appropriate watt age total. Adjustable timer for settings of auto, four, sb or eight hours which work with the photo cell. 2 year manufacturer warranty. Can be used with any lights.100 WattTransformer with Photo Cell a

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Friday, March 18, 2011

Cobra CPI 480 400-Watt 12-Volt DC to 120-Volt AC Power Inverter with 5-Volt USB Output

!: Used Cobra CPI 480 400-Watt 12-Volt DC to 120-Volt AC Power Inverter with 5-Volt USB Output save you money!

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The Cobra CPI 480 is a 12-Volt DC to 120-Volt AC power inverter that provides 400 Watts of power handling and 800 Watts of peak power. This unit comes equipped with two grounded AC receptacles and a 5-Volt USB output, allowing you to power and charge a wide variety of devices. It connects to your vehicle via a 12-Volt cigarette lighter plug or with direct-to-battery cables. In addition, this inverter keeps you and your gear safe with clean modified sine wave power, reverse polarity protection, thermal shutdown, low voltage alarm and shutdown, and an external fuse.

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