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A circuit generally includes cables which themselves contain conductors (Line [brown], Neutral [blue] and Circuit-Protective-Conductor [green-and-yellow stripes] in UK standards).
The term "Phase" was, until 2008, the previous name for the Line conductor.
For a typical domestic dwelling, there will ordinarily be only one Line conductor supplied into the building; thus, the installation would often be referred to as "single-phase."
For a typical large inductrial building (factory etc.), there will ordinarily be three Line conductors supplied into the building to provide the required level of voltage for the equipment; thus, the installation would often be referred to as "three-phase."
The above relates to the current UK electrical standards of BS 7671. The standards of other regions may of course differ.
Comment
While it is perfectly true that BS 7671:2008 adopted 'line' in place of 'phase', this was to correct its previous incorrect use of the terminology. 'Line' has alwaysbeen the correct term; 'phase', while commonly heard in the field (and in previous editions of BS 7671), has always been incorrect.
What else can I help you with?
What is the phase difference between the current through the resistor and inductor in an AC circuit?
The phase difference between the current through the resistor and inductor in an AC circuit is 90 degrees.
Single phase and three phase circuit?
Yes, there is a difference between single phase and three phase circuits.
Why phase difference exists between voltage and current in ac circuit?
because of the reactances in the circuit
Difference between two phase and three phase welding machine?
Three phase uses a safety circuit away from the machine, two phases uses you as the safety circuit
Compare the phase relationship between the voltage and current in a purely resistive circuit and an RL circuit?
In a pure resistive circuit the voltage and current are in phase. In an inductive circuit they are fro zero to 180 degrees out of phase. If they are in phase the Power Factor is 1 and 180 degrees the PF is zero. The exact amount of the phase difference depends on the specific circuit.
What is an acceptable difference in resistance between phases on a 3 phase motor?
The currents between legs of a three phase circuit should be within about 10% of each other.
The difference between short to a voltage circuit and short to a ground circuit?
A short circuit is an abnormal connection between two nodes intended to be at different voltages. A voltage circuit is caused intentionally for the purpose of voltage sensing. A ground circuit occurs between a phase and the ground.
What is the equation for calculating the phase difference between two waves?
The equation for calculating the phase difference between two waves is: Phase Difference (2 / ) (x) Where: Phase Difference is the difference in phase between the two waves is the wavelength of the waves x is the difference in position between corresponding points on the waves
What is the formula for calculating the phase difference between two waves?
The formula for calculating the phase difference between two waves is: Phase Difference (2 / ) (x) Where: Phase Difference is the difference in phase between the two waves is the wavelength of the waves x is the difference in position between corresponding points on the waves
Why capacitor is used in the dc electrical circuit?
Phase difference.
What is phase discriminator?
A phase discriminator is a circuit or device used to compare the phase difference between two input signals. It is often used in communication systems to demodulate or recover the original signal from a modulated carrier wave by detecting the phase difference between the carrier wave and the modulated signal.
When phase and neutral will short means what will be the voltage in neutral?
If the phase and neutral wires are shorted together, the voltage in the neutral wire will be the same as the phase voltage. This is because the short circuit effectively bypasses any impedance or resistance in the circuit, causing the potential difference between the phase and neutral wires to be equal.
