2007-02-14 19:31:22 · 7 answers · asked by betjake 1 in Science & Mathematics ➔ Engineering
Indeed the difference between single and three phase is the voltage carried, generally 3 phase is used in heavy machinery or machines with multiple functions like a CNC mill or lathe.
voltage for single phase is 240 and for three phase its 450, but due to harmonisation of colour coding only old 3 phase wiring or machines (prior to April 2004) will consist of red, blue, yellow, black, and earth (yellow and green) it is now Brown, Blue, Black, Grey, and earth.
Whereas Brown is L1(red), Black is L2 (yellow), Grey is L3 (blue), and Blue is N (black) and earth is earth
2007-02-14 19:59:39 · answer #1 · answered by NICK K 2 · 0⤊ 0⤋
The UK national grid supplies 3 phase electricity. The single phase supply to domestic premises uses 1 of these phases plus a neutral conductor at earth potential. Each phase has a voltage of 230 (+/-10) when compared to earth. The phase to phase voltage is 415v due to the phases being 120 degrees out of sync with each other. The 3 phase supply is generally used by industry for machinery with motors.
2007-02-15 08:40:40 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Electricity is generated from 3 phase generators. Thus you see 3 phases and ground carried all over the country.
From this you can take 1 phase and ground for typical house installations.
As a general rule, all the 1 phase systems is spread out on the 3 phase system in order to have equal load on the 3 phase system.
If you see the the powerlines out on the road (not cables) you see 4 wires. Counting from the bottom these are R-S-T-Ground.
The way to remember it is Root-Stem-Top-Ground. The ground is always the the top wire for safety reasons.
As mentioned, typical house installations is 1 phase (up to 240Volts), where as industrial installations is 3 phase (415 Volts).
2007-02-17 21:01:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋
3 Phase has 3 live 'phases', the cables which supply your house are 3 phase with each house having 1 phase supplying it. The phases are red, yellow and blue, so if the first house has the red phase, the second will have the yellow and the third the red.
Factories, offices etc.. will have all 3 phases with different areas on different phases.
Does this make sense?
Accross any 2 of the phases you will get 415V
2007-02-14 19:43:57 · answer #4 · answered by RRM 4 · 0⤊ 0⤋
Single is 240 volt , 3 phase is three single 240 volt combined in one motor for instant giving a more powerful supply 415 volt , very basically
2007-02-15 10:13:33 · answer #5 · answered by murray 2 · 0⤊ 0⤋
3 phase supply has 4 wires. 3 Phases and one neutral.
Single phase supply has two wires, one phase and neutral.
The line to line voltage in 3 ph is 415V and in 1ph it is 240V.
2007-02-15 04:22:10 · answer #6 · answered by salim h 2 · 0⤊ 0⤋
Single is typically 200v, one hot leg and ground, no neutral
3 ph is typically 400v, 3 hot legs and ground-reading the 400 across any 2 legs
2007-02-14 19:41:59 · answer #7 · answered by B00G1 3 · 0⤊ 0⤋