What is electrical wires?
Electrical Wires are single electrical conductors, while cables are multiple conductors that have been encased in the sheathing.
Most wires are made of copper or aluminum, but they can also be made of steel. They may be bare or insulated, and they're typically covered in a thin layer of PVC. If they have a PVC sheath, then the PVC is colored to indicate whether the wire is a neutral, ground, or hot wire in your electrical installation. We discuss wire colors in their own section in this guide.
Cables contain at least a neutral wire, ground wire, and hot wire that are twisted or bonded together. Depending on its purpose, the cable may contain more wires. The wires in a cable are insulated in their color-coded layer of PVC. The group of wires is then encased in an outer sheath to make up the single cable!
How to Identify Wires and Cables？
Wires and cables are the lifeblood of your home, carrying electricity from point A to B. But they can be tricky to navigate! Here's how to tell what kind of wire you're looking at:
Each jacket will have information printed to help you choose the correct product for your job. A letter code provides the attributes of the wire, along with material, gauge, and voltage rating.
Naming and Taxonomy
The NEC provides a system with letters to quickly identify what a wire's capabilities are. Some common lettering for wire includes THHN, XHHW, THW, etc.
THHN is the most commonly used type of wire in conduit and cable trays for services, feeders, and branch circuits in commercial or industrial applications. Below are the letters and attributes you'll see regularly in residential wiring:
T: Thermoplastic insulation
H: Heat resistance (up to 194 degrees Fahrenheit)
HH: High heat resistance (up to 194 degrees Fahrenheit)
W: Suitable for wet locations
Electrical Wire Color Coding
Hey there, DIY-ers!
We know you're all about that DIY life, and we want to help you ensure you know what you're doing (and how to do it safely!) when you start your next project.
When it comes to wiring, color coding is important. It's important not only because it helps identify the purpose of each wire, but also because it helps prevent accidents that could result in fire or electrocution.
Here's what you need to know:
Black = Hot wire for switches/outlets
Red = Hot wire for switch legs and connecting to hardwired smoke detectors
Blue & Yellow = Hot wires pulled through conduit; blue is often used for three- or four-way switch applications, and yellow is for switch legs to control fans, lights, etc.
White = Neutral (can be hot if marked with black or red to indicate it's no longer a neutral)
Green & Bare Copper = Only for grounding purposes
What is the red wire in electrical？
Red wires are usually used as secondary hot wires. Red wires are also hot and should be clearly marked to avoid the dangers of electrocution. Red wires are commonly used when installing ceiling fans where the light switch may be.
Green insulated wires are often used for grounding. Ground screws on electrical devices are often painted green, too. Never use a green wire for any purpose other than for grounding, as this may pose a serious threat of electrocution for you or a professional working on your home’s electrical system."
To ensure you have the right wire size for your electrical system, you need to consider the gauge of the wire, what it will be used for, and it's capacity.
Wires that are not properly matched to the amperage of the circuits they serve can create a notable risk of short circuits and fire.
The proper wire size is critical to any electrical wire installation. Wire sizing indicates the diameter of the metal conductor of the wire and is based on the American Wire Gauge (AWG) system. The gauge of a wire relates to the wire's current-carrying capacity or how much amperage the wire can safely handle. When choosing the right wire, you must consider the gauge of the wire, the wire capacity, and what the wire will be used for.
Where to buy electrical wire？
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