You might be wondering what the connection between heat shrink wrap and PVC is, but both are widely used materials in modern day construction. In particular, both have a connection for use in electrical engineering.
Polyvinyl Chloride (PVC) is commonly used to create the tubing which protects electrical wires. PVC is formed by polymerizing the monomer vinyl chloride, creating a rigid chain of carbon atoms. For its application as insulation for electrical wires, PVC needs to plasticized. With plastic additives PVC becomes flexible enough to protect the wires even when they bend. However, the plastic additives can become a cause for concern.
In construction the major concern with electric wires that have plastic additives is the release of HCL gas when fires destroy a building. However, in areas where smoke is a major hazard, PVC free insulation is preferred. So long as air is cool enough to be breathed the HCL breaks down onto surfaces, making it unavailable for inhalation.
Despite the concerns inherent with burning PVC, the insulation is also prized because it is more flame retardant than other materials. Like PVC, heat shrink tubing has a certain degree of heat resistance. Where shrink tubing differs from PVC is in the result of heating it up.
When heat is applied to shrink tubing two different things can happen. In one instance, a material with many monomers will be heated until they polymerize. When the monomers polymerize the material's density increases as the volume decreases, causing the material to shrink around whatever it is insulating. In the opposite instance tubing is heated, expanded, and then allowed to cool after being mechanically stretched over the material being insulated. Thus when the material returns to its pre-heating size it will be tight around the insulated material.
The most common applications for heat shrink tubing are as insulation for small electrical wires in electrical components and also for computers. Many custom computers feature tower casings with windows and to make the wiring more aesthetically pleasing, manufacturers will use the heat shrink tubing to clean up the appearance of the computer insides a bit, thus preventing a seemingly random winding of wiring.
The tubing can also be used to protect conductors, protect exposed ends of wires, and also protect joints and terminals in electrical engineering applications. Since it can be used for so many different applications the tubing will often be color coded to facilitate easy of system identification when servicing components or computers.
To find an electrical contractor, you must first determine the type of work you need done in order to get the expert in that sub-section of the field. For instance, if you want to set up emergency power as back-up in case of an outage or failure, then you don't need an electrician who specializes in outside work only, like power line construction.
Similarly, if there is infrastructure work needed to be completed, an electrical worker who can set up your home automation service would likely not be able to implement electrical infrastructure such as power line construction.
You can either post your project on sites created for this purpose, where electrical contractors will place bids, or you can research your choices by obtaining word-of-mouth references and searching online. To jump-start your search, use the phrase "electrical contractor" with your geographical location added, so if you live in California, for example, your search term would be: electrical contractor California.
If you are too broad in your search (using "electrical contractor USA") or too narrow (using "electrical contractor San Jose") you will not obtain optimum search results. In the first instance, there will simply be too many responses to make it possible to look through; in the second, you may lose a state-wide contractor that has branches in several cities.
Therefore do the state search first (such as "electrical contractor California"), and from the first ten or so pages from that response, you can whittle down to your immediate town or county.
No matter how you actually find an electrical contractor, you need to protect yourself, and some suggestions include: obtain the contractor's business license number and make sure you call the local licensing office to verify that company's standing.
Remember to search the Better Business Bureau, where you can discover if there were any complaints filed against the electrical company. Call the insurance agent that represents the contractor, to confirm that their public liability and property damage coverage is in full force and effect.
As important as all of the foregoing, ensure that you obtain past client names and contact information from the contractor, and make sure you speak to these people. They were once in your position, searching for a reliable electrical contractor and have given permission to the one you are interested in hiring to be contacted as a reference.
Use this source, and take up any invitation given to see the work in person. Ask about everything: the bid or estimate; the finished cost; the time frame given and the actual time it took to do the job. Once you have done your homework, you can make an educated choice.
HVAC is a vital component in the design and construction of buildings such as schools, hospitals and other large structures. Unlike the residential air-conditioning systems, HVAC incorporates filtration units and other large scale applications for industrial type usage.
One specific HVAC part used by contractors is the semi-hermetic compressor. It is commonly installed for use by the commercial refrigeration, as well the commercial and residential, air conditioning industry.
Copeland compressors have been in service since 1986. They are famous for their patented Scroll compressor, offering hermetically sealed (airtight) units that resist corrosion from dirt, dust and other airborne particles. This item and hundreds more comprise the inventory of an HVAC part supplier.
From commercial to residential needs, a specific HVAC part may, at times be difficult to locate. Some businesses have maintenance departments that handle the HVAC systems. The homeowner or smaller business owner, however, that needs access to an HVAC part can usually find the item on the Internet.
Whether a Ducted Reverse Cycle/Refrigerate or Evaporative Cooler system, HVAC parts are needed for their operation and effectiveness. The advantages held by the first example are the ability to heat and cool the entire home and may last for years.
One disadvantage is cost. Another is that during operation it may lead to stale air within the home. This can be addressed with the installation of a fresh air inlet which is required in commercial applications.
The second example uses air flow over wet sheets used primarily in commercial buildings. It is inexpensive to operate but will not function in humid weather conditions. The dampness brought into a building can cause problems by producing mold.
Semi-hermetic compressors function to compress gas by diminishing its volume. Once compressed, the gas increases in temperature and it is the method of managing the gases in an HVAC unit that determines the heating or cooling properties.
For an HVAC part installation to be successful in a complete system, the following conditions are necessary for its effectiveness and functionality:
* It needs proper room size for air-flow
* Static air pressure drop across the handler meeting specifications
* Sealed duct-work providing proper air flow
* The return system sized for correct return air flow.
* Sealed return duct-work and balanced air flow between supplies minimizes temperature gain or loss between air handlers and room registers
* Properly charging with refrigerant
* Proper burner and draft operation
With all HVAC installations, the parts and related tools for a successful system are determined by the skills of those responsible for the final inspection. When a homeowner seeks to install or upgrade their residential system, the HVAC part to complete the job can be easily obtained through an online HVAC supplier.
From compressors to gauges, the online source for HVAC supplies is only a click away to place the order and arrange for shipping if needed. A good supplier has all the details you need.
The phrase "getting your electrical wiring up to code" is often heard nowadays, in particular when looking at the renovation of older homes. However, although many people understand that upgrading a home's electrical wiring that it is standard with all the national requirements and local building codes is a good thing, they do not always understand what the term actually means. As a matter of fact, bringing wiring up to code can vary from house to house because of the varying electrical installations. Here's a listing of some of the most common wiring situation to take into account when considering upgrading to bring your electrical wiring up to code.
Electrical Upgrades For The Basement
A lot of homes which are older don't have basements wired based on current electrical codes. Probably the most commonly identified code violations in basements is standard electrical outlets. Even if your basement is unfinished, you need to have your basement outlets protected with GFCIs. Basements have a tendency to be damp, so GFCI outlets is an important safety consideration.
Electrical Upgrades To The Kitchen
The kitchen is yet another room in the older home which frequently suffers from electrical code violations. For safety purposes a microwave oven should be placed on its very own circuit in the event that it should generate a surge or spark, or if it overheats. Additionally, all electrical outlets accessible from the kitchen countertop area and near the sink need to be upgraded to a GFCI outlet if they are simply regular outlets.
Bathroom Electrical Updates
In regards to electrical code upgrades, bathrooms and kitchens will be in the same category. In the interest of safety around water, all outlets should be upgraded to GFCI outlets. Or, decide to protect the whole circuit which supplies the restroom using a GFCI breaker. When lighting is installed in the bathroom, #12 gauge wire must be employed to meet electrical codes.
Attic Electrical Updates
When you're trying to meet all building and electric codes, your attic is yet another place that may have issues. An example is when the attic has any home equipment like cooling or heating systems, then a light needs to be installed. The same is the case when the room is used for storage. With regard to safety, you should plan on installing the light near to the equipment or storage area.
Other Things To Consider For Safety
As discussed, a lot of electrical code requirements are centered on safety issues. As a matter of fact, this really is one of the greatest reasons why electric codes exist in the first place - to safeguard the security of the public. If you are upgrading all of your electrical issues, it is also a good idea that you upgrade your fire protection. To be safe, every bedroom must have its own smoke detector. There should also be an individual smoke detector on each floor of the home. While you are concentrating on the wiring in your house, you can go the extra mile and connect the many individual smoke detectors for added safety.
The injuries related to electricity are caused by electrocution. Electrocution can result in: minor shocks, which can cause other accidents like falls; medium shocks, which can result in burns and even critical burns and major shocks which can result in death in the same way as in some American prisons.
The victim can be given an electric shock by coming into contact with a live wire or by the electricity from a live source arcing out - in essence finding earth through that person's body. Most electric shocks are not serious and are over before you know that it has happened yet they are frightening afterwards.
A fall ensuing from a mild electric shock almost certainly has greater potential to be fatal than the shock itself. For instance, if you were changing a light bulb from a step ladder and you thought that the power was off, and it was not, you may receive a short sharp shock, and it could make you to fall off the ladder and break your back.
On the other hand, high voltage electric shocks can result in burns deep in human tissue whilst leaving just minor signs of the injury on the outside. It is very critical not to become complacent about electricity, because, like the open sea, it does not suffer fools gladly. Here are a couple of electrical safety pointers to help keep you safe.
1] Always check power tools for damage and damaged plugs or frayed cords before use. You may have damaged it last time you used it and got away with it that time
2] If you are working in the same area as others, particularly on a building site, do not leave your leads trailing across the floor - try to tape them to a wall or a bench, because people may step on them, run wheel barrows over them or spill water on them.
3] Always use the correct gauge cable and fuse for your apparatus.
4] If anything becomes warm while you are using it, be aware that it might be a sign of an approaching problem. Leave warm apparatus or sockets to cool down, if it occurs again, get them checked by an electrician. Do not over load electrical sockets.
5] Try to use a dry wooden ladder if you are working near cables, because wood does not conduct electricity.
6] If you are using any apparatus that produces heat or strong light, do not train it on anything that might catch fire.
7] Fit fast-reacting circuit breakers between your equipment and the source of electricity to reduce the shock that you might get. These devices sense a faulty earth and turn the appliance off in milliseconds.
If your appliance or electrical equipment has a button for checking the earth, use it every day and if you are going to work on a light socket, an electrical socket or the fuse box, test it first with one of those electrical screwdrivers with a small bulb in it. You poke it into the circuitry and the bulb lights up, you have just had a narrow escape. Be more cautious next time!
Bringing power into a building from the electrical lines that run from the street a single phase converter controls the flow of energy inside the building. Where an office might be set up with a series of computers that are backed up with emergency batteries and have surge protection the single phase system may not be sufficient to handle the load that the energy consumption requires. inide an industrial shop that is using a number of different machines to fabricate various products a 3 phase converter can make the difference between straining the electrical use and allowing each station in the manufacturing shop to be operating at full power throughout the day.
The installation of a rotary 3 phase converter allows drill presses, saws and other pieces of equipment to be run without adding to the energy costs or the electricity that is being pulled from the power grid. Adding to the energy efficiency of a business that is relying on the constant drain of the utility the converter is connected to the breakers that bring in power to the building and are loaded to increase the output of electricity without adding to the use of energy. The lower cost and higher output allow industrial manufactures to make the most of their utility consumption.
Hooked up to woodworking and steel machining equipment the converters are able to provide all the electrical power that heavy duty machines need to operate in a non-stop environment. Running air compressors, hoists and lifts and air conditioning or heating systems much more efficiently the addition of a 3 phase converter is able to boost the production of many manufactured goods without altering the amount of energy that is consumed by the building. In offices where server farms are required to manage the data flow that is coming into the system the converters can be added to the electrical equipment to make them more efficient in their use of electricity.
Available in three sizes that can manage different loads and deliver the same level of energy consumption to commercial and industrial complexes, the full capability of the 3 phase converter can be determined with an inspection of the property and the electrical usage needs of the business that is looking for a way to cut their utility bills down to size. Offering an alternative to paying for the rising cost of electricity that seems to increase each year the converters are the best way for a business to manage all of their energy consumption needs without adding to their utility bills.