Differences Between THHN Wire UF-B and Service Entrance Cable

Electrical Wire

There is all different types of electrical wiring for different applications. We will break it down for you piece by piece. Most common terms for copper electrical wire would be building wire, THHN /THWN, Romex wire, UF-B Cable and Type SE (service entrance cable). All of these copper wires and cables have their own advantages and disadvantages based on the individual wiring application. Each one will be described in more detail below. Building Wire is just another broad term used in the same way as electrical wire. Since it's used mostly in the building / construction field its become a popular term.

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THHN / THWN Wire

THHN / THWN-2 copper electrical wire is the most basic form of electrical wire which is used in houses, buildings and control circuits not exceeding 600 Volts. All of our THHN electrical wire is dual rated with THWN-2 because the THWN is so popular that South Wire (Largest Electrical wire manufacturer in the USA) decided to put both ratings on all their THHN building wire. It's composed of soft drawn bare copper strands, covered with a PVC (Polyvinyl Chloride) insulation and a nylon coating for easy installation in cable tray. The 18 awg through 10 awg come in stranded or solid copper. The stranded wire is more flexible, while the solid wire is easier to run / snake through tough areas.

More specifically, THHN wire is run through houses and buildings to light switches, electrical outlets and light fixtures. The smaller gauge sizes of THHN is most commonly sold in 500' spools which a lot of suppliers won't cut. WesBell Electronics will cut the #18 - #10 to 100' spools and cut the #8 - 1000 mcm per foot! That's right, you can buy 1 foot of wire if needed! WesBell understands that every application is different and doesn't want contractors to have to suffer excess copper wire. When adding that into the the resale price it could cost you the job! Buy exact lengths, get exact quotes and don't have any extra copper at the end of it! Copper has jumped back up to over .00/lb, so every foot of wire counts!

Romex Wire

Romex copper electrical wires and cables are made up of multiple THHN / THWN wires (conductors). Example; Romex 12/2 is 2 THHN wires and a bare uninsulated ground wire covered with an overall PVC jacket. This way electrical contractors only have to run one bulk wire instead of either running 3 separate wires or individually running each wire. Romex wire is ONLY used for indoor applications. It has NO protection against moisture, gas or solvents. It should NOT be used outdoors even if it's in cable tray.

UF-B Cable

UF-B (Underground Feeder) copper electrical wires and cables are a slight upgrade from Romex wiring. It has the same concept of THHN conductors wrapped with a jacket except it's a more complex jacket. The bonus to UF-B Cable is that it can go outdoors and even directly underground. There's no need for conduit or cable tray and the price difference isn't that significant. If you need the cable to go outdoors at all make sure you get UF-B instead of Romex because it's not worth the hassle of replacing the Romex down the road over something roughly 10-15% higher in cost.

Service Entrance Cable Type SE

Sometimes you will see an "R" (SER) or a "U" (SEU) after the Type SE. The R stands for round (more common) and the U stands for flat. Southwire Type SE electrical cable, service entrance cable is primarily used to convey power from the service drop to the meter base and from the meter base to the distribution panel board; however, the cable may be used in all applications where Type SE cable is permitted. SER may be used in wet or dry locations at temperatures not to exceed 90°C. Voltage rating is 600 volts. Southwire Type SE cable is constructed with sunlight resistant Type XHHW-2 conductors or Type THHN/THWN conductors.

Copper conductors are annealed (soft) copper. Cable assembly plus reinforcement tape are jacketed with sunlight resistant gray polyvinyl chloride (PVC). Available as 1 conductor with a concentric ground, 2 conductor with a round or concentric ground, or 3 conductor with a bare ground. SE cable is jacketed with gray sunlight resistant polyvinyl chloride (PVC).

Differences Between THHN Wire UF-B and Service Entrance Cable

SLR Lenses - Learn the differences

Have a nice, shiny SLR? Glad you now have the ability to change lenses when you want more? I have no idea what kind of lens you should get?

Welcome to the typical situation for the first time SLR buyer.

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Unless you are) a pretty serious hobby (in this and probably stop reading articles, you can use a little clueless owner for all of your options as an SLR lens. You are probably wondering what kind of lenses is necessary and what allcrazy letters and numbers before the name means. As a poor consumer to choose?

I wish it was easier for you. I'm not going to give you a complete course in everything you know about camera lenses, but I hope that after this, you have an idea, now that you want. First, let me explain that if you have a good reason to choose otherwise, you want a zoom lens. As you probably know, a zoom lens to zoom lens (changingHe began calling her name, the "focal length" from now on. These are extremely comfortable and of high quality these days, so there is really no reason for a fixed focal length lens or "first" choice.

So it will be the first thing you notice when shopping for zoom lenses of focal lengths. focal length zoom lenses are the dash number system number, eg 18-70. These numbers represent the focal length in millimeters, and the higher the number,"Zooming" The image is displayed. Assuming you're using a digital SLR, this particular example is a zoom from a moderately wide angle (28 mm) to moderate) close (70mm. This objective would be good, every day is to carry around.

The second set of numbers represent the "speed" of this, which basically means the amount of light the lens lets in the photograph, the more light the better. This is what the "f" is the number the less the better. For example, a 18-70f4 lens is better than a 18-70 f5.6 lens. Sometimes two numbers, such as "F4-5.6", which means that the speed of the slowest zoom which means you get to see. This is perfectly normal, but its something to be aware of.

So, should you buy lenses? Well, the simple answer, to buy something with a wide range, as has been done 18-300, and with it. However, a rule of thumb, the more the zoom range, the worse the image quality. However, many of these lenses much better than themto use, and for many casual photographers, the compromise image quality is worth the convenience.

If you want better lenses, trying to cover a wide angle zoom for wide angle and a telephoto lens if you really need to zoom up close. The purchase of the first party lenses (ie Canon lenses for Canon cameras) will almost always get better quality than the lenses of third parties, if you pay more. Also, be sure to check the contributions to a goal before you buywill be happier about the decision.

I hope this has helped some of the mystery shopping for a lens for SLR cameras. Remember, it is the camera, the lens or other piece of equipment that makes the images so large. If you are the person behind the camera. So learn, how to take better pictures, get a fixed set of lenses, and you are on the way to a great photographer.

SLR Lenses - Learn the differences