National Electric Manufacturers Association 480 Volt Motor Wiring Data (NEMA) Starter, HMCP, overload phase wires, GND, and conduit size: According to section 250.122 of the National Electric Code, 1 horsepower = 0.746 kW equipment grounding is sized for copper conductors (NEC). The starter wire is also called the load side wiring because it carries current from the battery to the motor. It must be able to handle the maximum load presented by the motor plus any accessory loads that may be attached to it. Therefore, the starter wire should be able to carry the total load without breaking or conducting intermittently. The NEMA standard defines four categories of voltage for load side wiring based on the amount of current that can be carried by the conductor. These are 15-amp, 20-amp, 30-amp, and 40-amp circuits. A starter wire must be large enough to meet the requirements of the category of circuit it will be used with. For example, if you plan to use your vehicle only as a trailer when pulling a fifth wheel, you would select a 15-amp starter wire. If you plan to use it as a regular car, you would select a 20-amp starter wire.

The NEMA standard also defines **two categories** of protection based on the expected length of time that the circuit will remain energized: instantaneous ground fault interrupting (IGFI) and delayed ground fault interrupting (DGFI).

NEMA 14-30 receptacle, 8 AWG 3-conductor wire, and a 30-amp, double-gang circuit breaker are all included. Because the ground wire is not considered a conductor, a three-conductor cable contains **four wires**. A 50-amp NEMA 15-50 receptacle, 6 AWG 3-conductor wire, and a 50-amp double-gang circuit breaker are included. These cables are used where there is likely to be some risk of **electrical shock** from contact with the ground.

The type of cable you use depends on how you plan to install it. If you plan to bury the cable, a black or red wire should be able to handle the load. Otherwise, you may want to use aluminum or green wire instead.

You should also check with your local building department about required permissions before you begin work. Some cities require you to obtain a permit before you can dig up streets or lawns to install cable. Other areas may have special restrictions on what types of cables you can run.

Cable runs longer than 100 feet must be done by a licensed electrician. In addition, if the cable is inside a wall, ceiling, or floor, it must be done by **a certified wiring specialist**. This is because these areas provide many opportunities for damage to occur to cables.

If you're just running cable from one room to another, any old household cable will work fine. It may even be possible to reuse existing cable if it's in good condition.

How do you size a transformer in **this case**? The load amperage of a 120-volt motor is 5 amps. Divide **120 volts** by 5 amps. This equates to 600 volts. Let us now multiply the 125 percent start factor by two. Multiply 600 by 1.25. This corresponds to 720VA, and most transformers are enlarged by a factor of 25VA or 50VA. Therefore, the number that comes out after multiplying 625 by 1.25 is 495.

The next step is to divide this figure by 0.8 to determine the number of windings on the secondary side of the transformer. In this case, we will use 30% as our division factor. So, 495 divided by 0.8 is 59.5. Since one turn is approximately 2.54 cm, then each secondary coil will require about 59.5 cm of wire.

Now, since the total length of **both coils** should be at least twice the height of the motor, then the minimum amount of wire needed for **these coils** is 118 cm, or 47 inches.

This means that each leg of the cross circuit must contain at least 23 inches of #14 wire or larger. A common household current is 120 volts, so each phase has 20 amperes flowing through it. In general, the voltage across any resistor is constant, so if you increase the resistance enough, the current will drop to zero.

If you have **100 amps** from step 1, for example, your grounding conductor should be eight gauge wire, or eight AWG. The voltage is not high enough to affect it at this size.

The other option is to use 14 AWG wire which will carry the same current as **10 AWG** but will be more resistant to damage from rough handling.

Grounding conductors need to be continuous from house to house, and back to where they start. If one section gets damaged, then the whole system becomes vulnerable because there is no longer a path to ground **these circuits** should never be split up between **two different cables**.

They must also be properly terminated in both houses (or at least one) so that they can function as a single circuit.

Check with **your local electrical code** when selecting sizes for wiring installations. In some areas, it is required by law that certain wires within your home be set aside for ground purposes. These should always be the first things connected to when working on an electrical panel.

Three-phase horsepower must be in the range of 1/2 to 500 hp. 7. Three-phase 115-volt motors with a power range of 1/2 hp to 2 hp are required. 8. Three-phase motors with capacities ranging from 3 to 200 hp must have a voltage range of 200 to 575 volts. 9. Three-phase motors with capacities ranging from 250 to 500 hp must have a voltage of 460 or 575 volts. 10. The weight of copper conductors for three-phase circuits should not be less than that for single-phase circuits.

A three-phase electrician's wire is used to connect three separate wires into one circuit. The term "three-phase" means that each conductor within the cable carries **a different electrical potential**. A normal household circuit is made up of two conductors, but some circuits need more than three conductors to be safe. For example, **a four-wire network** will have two separate hot lines and two separate neutral lines, so six conductors make up **a complete set** of wiring for a four-wire network.

Cables used as three-phase electrician's wires must be of a type specifically designed for this purpose. The individual wires within the cable must be large enough to carry the load imposed upon them. Otherwise, they might fail under the pressure of use. The number and size of the wires within the cable must be sufficient to meet the requirements of any future changes or upgrades to the system.