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240 volt cable is very important in residential homes for powering heating and cooling devices as well as appliances that consumes more energy.
In the previous time, they have been known as 220 volt electric circuits, but they are now refer to as 240 volt electric circuits. Over the years in America, there have been the problem of accommodating increase electric loads. In resolving this, the American utilities increase the minimal voltages in order to lower the electric current and the wire size that is being used.
In fact, it is for same reason 110 volts electric circuits are now 120 volts electric circuits. Notwithstanding, people still make use of 110 and 220 volts term in their conversation but in its real sense, they are not in use any longer.
The electric circuits are primarily designed to make use of principals of the electrical phases. For example, double 120 volt electric circuits that are 1800 to each other can be linked together to create one 240 volt electric circuit. This will yield twice the quantity of electrical power with the same wire size. There are two major types of 240 volt electric circuits and they are classified based on the device you are supplying power to. Each type of the 240 electric circuits has a slight difference that makes them to operate differently. Having in depth knowledge of these variances will help you to know the suitable type of cable to use when fixing a device or a new cooling/heating systems.
3-Wire 240 Volt Cable
Nearly all the contemporary appliances that are common function off 120 volt cable and electric circuits. Connecting this equipment requires the use of three wires. The blue or black wire (also known as the hot wire) is the one that conduct electric current to the device. The white wire is usually neutral and it is used to perfect the circuit. It can be outlined back to the electric panel where it is joined to the neutral bus. The green wire or sometimes naked copper wire is the earth wire and it is used for electric safety.
In some cases in 240 volt cable, there may be no need for the neutral wire; instead an extra hot wire may be included. The two hot cables will now complete the circuit. In order to safely account for the two leads, the wire must be joined to a two – pole breaker at the electric circuit panel. In other word, a two single – pole breakers that have been wired together is known as a two – pole breaker. 240 volt circuit that contains this form of wiring is popularly used in electric heaters, boilers, or condensing units as a source of power. Appliances that belongs to this group does not require 120 volt circuit.
4-Wire 240 Volt Cable
The second type of 240 volt circuit is commonly used for appliances such as dryers and electric stoves. Though this device make use of 240 volts to control their main function, it can also make use of 120 volts to control equipment such as clocks and timers.
It is like a 3 – wire 240 volt cable, the notable difference is that a white or neutral wire is included with other wires to perfect the circuit for equipment or devices that make use 120 volt circuit. Just like other types of wire, a bare copper or green wire is also included as the earth wire. A 4 – wire 240 volt cable, just like 3 – wire 240 volts, will require fitting two – pole breaker in the circuit panel.
Changes to the National Electrical Code (NEC) now require that this type of electric wiring should be used predominantly in residential home construction. That is why most of today’s dryers and oven ranges come equipped with a 4-prong plug.