What are the L1 and L2 on a wiring diagram?

What are the L1 and L2 on a wiring diagram?

The neutral (denoted as 'N') is the three winding ends joined together at the center. The other ends are referred to as line ends (denoted as 'L1 ', 'L2 ', and 'L3 '). Line to line (or phase to phase) voltage is the voltage that exists between two lines (for example, 'L1' and 'L2'). Neutral to ground (or phase to neutral) voltage is the voltage that exists from a line to the ground (or phase to earth). This would be the case for circuit breaker-protected circuits or dead zones in rooms where power strips are used.

Line voltages are usually indicated by stickers on the wall box or nearby. If you're not sure what they are, call your electric company to find out who supplies service to this house. They can tell you which wires are which line.

Neutral voltages are usually indicated by a sticker on the panel or nearby. You'll need to know which screws connect these pins together before you start working on the panel. Again, call your electric company if you aren't sure how they are connected.

Grounds are always indicated by green labels on the cable itself. These connections should always be made with pigtails, not wire nuts or metal clamps. If you use wire nuts or metal clamps instead, you may end up connecting multiple grounds together (which is illegal in some cases), or you could break wire continuity if one of them gets damaged during construction work.

What kind of wiring is used in three-phase wiring?

Lighting, small-appliance loads, and receptacles are frequently linked between phase and neutral in three-phase wiring, but bigger equipment such as air conditioners and electric heaters are connected between two phases (i.e., phase to phase). Heaters and air conditioners require more current than a lamp or small appliance, so they need wires with larger cross sections. These bigger wires are called "commons" or "third conductors." Three-wire cable for these uses is called "3P cable."

In 3P cable, each conductor within the cable serves as a phase as well as a neutral. Thus, all three conductors must be tied together at both ends of the cable to provide continuous electrical power from one end of the cable to the other. The term "triple-terminated" describes this type of cable assembly. Most old wiring contains 3P cable, and new wiring with 3P cable can be substituted for old wiring without changing existing fixtures or appliances. Old 2P cable can't be replaced with 3P cable; instead, it must be removed from the circuit panel and either discarded or recycled.

Old 2P cable can still be found in some homes built before 1965 when 3P cable wasn't available. This type of cable has only two conductors instead of three, and they aren't tied together at both ends of the cable.

What is the use of 2-phase electrical wiring?

We utilize 240V line-to-line voltages for larger power loads. It is commonly referred to as split phase, however I refer to it as 2-phase. You have one phase on each of two legs that are 180 degrees out of phase (phase between legs = 360 for one phase, 180 degrees for two, and 120 degrees for three phases, e.g., 360/N where N is the phasing). This allows for efficient distribution and utilization of voltage since only 50% of circuits are powered at any given time.

The reason we need more than one phase is because some devices require a full cycle or circuit break before they will turn off. For example, if you had just single phase power and you wanted to turn off a lamp, you would have to wait until the voltage dropped to zero before turning off the lamp. With two phases, you can switch both phases to the same value (usually ground) which will kill the current in both circuits simultaneously so they don't have to wait for the voltage to drop completely before shutting off.

Heating elements such as heaters, hot plates, and irons all require constant current to function properly. If you shut off the power too soon, the element won't get hot enough to provide effective heating. If you leave the power on too long, you're wasting energy.

So by utilizing two phases of power, we can avoid having to shut off portions of our load simultaneously which improves efficiency.

About Article Author

Steven Bitting

Steven Bitting has been working in the automotive industry for over 20 years. He started out as a parts delivery person, but quickly progressed to become a mechanic. Steven's always looking for ways to improve himself as an individual and as a mechanic, and he takes every opportunity that comes his way to learn more.

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