what is 208 voltage used for? is it three phase?

Answer 1

If you have a 3-phase transformer that has a wye connected secondary winding with 208 volts, line-to-line, the line-to-neutral voltage is 120 volt. The secondary winding can thus provide three 120 volt single phase circuits and one 208 volt 3-phase circuit. This arrangement is used in some commercial buildings to provide 120 volt for lighting circuits etc. plus 208 volts, 3-phase for air conditioners etc.

Answer 2

208 is most commonly used in the US for commercial applications. It can be either single phase 3 wire 208/120 or 3 phase 4 wire 208/120 depending on the requirements of the building. The biggest advantage is that in a 208/120 3 phase system the code does not require ground fault protection at the service entrance above a certain amperage , which for some is considered a nuisance. The only place I see 208/120 is motels. The installation cost over 480/277 3 phase makes 208/120 less appealing.

Answer 3

208 3 Phase

Answer 4

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120/208 is a three phase voltage mostly used in commercial buildings. Most homes run 120/240 which is a single phase voltage. that is why most motors and other equipment is what we call multi tap to be able to use different voltages

Answer 5

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RE:
what is 208 voltage used for? is it three phase?

Answer 6

208 volt.s is derived from a three phase four wire, grounded neutral system and may be wired either single, (two wire), or three, (three wire), phase,
with 120V. available phase to grounded neutral.
This is common in built up areas.
If the voltage is 208, there is three phase power available somewhere nearby, but not necessarily in the building you're in.
'208` is generally used for large appliances, (water heater etc.), and motors 3 horsepower, and up.

More rural or residential areas commonly use 240V. single phase for the same purposes with a grounded center tap for 120V. and the three phase option unavailable.

Answer 7

the good thing for using a three phase 208 volts, 4 wires in commercial buildings is economical, because you only need one transformer to power your lighting and 3 phase loads, still you can balance well your line phases by distributing your single phase loads in every phase plus neutral, while in a 240 volts three phase, it is seldom that the transformer will provide 3 single phase 110 volts so the probability of delta connected 240 volts is only one phase of the transformer has a center tap for lighting, so your phase currents will be unbalanced. still, you can run electric motors rated 240 volts 3 phase, to the 208 volts 3 phase circuits(all our boilers that are produced having a 208 volts 3phase requirement for power have a fan motor rating of 240 volts, 3 phase)

Answer 8

As EE68PE says, 208 Volts of alternating current (Vac) is the Line-to-Line (L-L) or Phase-to-Phase voltage typically available from the secondary windings of a 3-phase 4-wire WYE transformer servicing a commercial building in the United States.

Along with the voltage between the 3-legs 120-degrees apart you get 3-each phases of 120 Vac Line-to-Neutral (L-N)/Phase-to-Neutral like you find in your home receptacle to power your laptop or toaster. Similar to understanding the Law of Gravity for knowledge about how stuff works, Ohm's Law is inviolable and goes something like this: Power (measured in watts) is volts times current (measured in amps) and the more amps you have the bigger the wire has to be to minimize resistive power losses (current squared time resistance (measured in ohms)). Copper and power is expensive so you want as much voltage as possible to minimize current and diameter of the wire. Therefore commercial lighting typically uses the 208 Vac L-L instead of 120 Vac L-N. Things would be even more efficient using the higher 277 L-N/480 L-L Vac used in light industrial settings, but rather than just getting merely electrocuted and your heart stopping you cook and smell like burnt flesh when there's an electrical problem. Canadians are more efficient than in the US, but smell even worse when there's a problem because their industrial equipment typically uses 600Y/347 Vac. There's a pattern to 3 phase transformers: multiply the L-N voltage by the square root of three √3 (1.732) to get the L-L voltage:
120 * √3 = 208
277 * √3 = 480
347 * √3 = 600

If decimal multiplication is too hard because you ain't got no calculator, just WAG a teeny bit on the high side by adding about 3/4, which is a half + half a half, i.e
120 + 60+30 = 210
280 + 140+70 = 490
350 + 175+87 = 612

mechnginear is wrong about 208 Vac, both about for residential use and 208 being single phase. Residences use 3-wires (Line-Neutral-Line) from a center-tapped transformer which has two-each of 120 Vac L-N. The difference between the two L-N connections is the alternating current/voltages are 180 degrees out of phase with each other. When one is line is fully positive at 170 volts peak the other is fully negative at -170 Vp with a 339 Volt peak-to-peak difference averaging out to 240 volts per cycle of equivalent DC voltage at 60 cycles per second (Hz). Volts RMS/average * √2 (1.414) = Volts Peak. This would be the same voltage at 50 Hz (Hz rhymes with hurts if the symbol is unfamiliar).

William Canter is a moron. e to the 0 = 1, (duh, anything to the power of zero is 1) therefore the natural logarithm of one, ln(1), is 0. As in zero, nada, zip, zilch. Scheez, everybody knows that! 1/√3 = 0.57735. This boy goes off half ****** with half vast answers.

Nobody yet mentioned it, but 208 Vac also occurs in 3-phase/2-phase “High Leg Center-Tapped Neutral Four-Wire Delta (4WD)” transformers, aka D120/208/240, between the high- dog-, wild-, stinger-, or red-leg opposite the center-tapped neutral and the neutral. The color of the insulation of wires coming from the high-leg wild phase “should be” orange to distinguish it from the other non-grounded conductors in the possible 120 and 240 volt configurations, which by convention are black and red:

Neutral (white) - Black: 120 Vac, 0 degrees
Neutral (white) - Red: 120 Vac, 180 degrees
Neutral (white) - Orange 208 Vac
Black-Red: Vac 240, 0 degrees
Black-Orange: 240 Vac, 120 degrees
Red-Orange: 240 Vac, 240 degrees

Answer 9

I just love to find old questions that the answers are completely out to lunch. 208vac IS 3phase. Any phase referenced to neutral is 120vac. It's math, take the ln (natural log) of 1, .57*208 = 120 and this is due to 208vac referenced between phases, the 120vac is from phase to neutral. Residential panels are 120/240, not 120/208.

Answer 10

208v Single Phase