At least 14 by my count 10 years ago. I should of checked the voltage. I’ll attempt to answer this without assuming that the reader has not yet learned the concepts of phase and vector. Jraef.
A 5 Hp, 208V VFD will be rated about 17 amps (per phase).

A standard 3Hp, 208V, 3-phase motor is rated about 11 amps (per phase), so that is why I'm saying it is at least a 3Hp motor on your fan if it is drawing 10 amps per phase (but it could certainly be larger). On a three phase name plate the amps rating is the amps per each leg. In the US 120 / 240V 1 Phase 3 Wire is the standard for homes and 240V 3 Phase Open Delta is the standard for small buildings with large loads. No! 02-24-2017, 06:36 PM #2. In parts of the world 240V Single Phase 2 Wire is the standard for homes.

In this tutorial we’re going to be learning more about three phase electricity. The (ideal) voltage is 480V line to line. I should of checked the voltage. Easy enough. Three phase voltage can be measure line to line (L1-L2, L2-L3, or L1-L3) with a quality digital voltmeter. I got 9-.6-9 It sounds good. Although single-phase power is more prevalent today, three-phase is still chosen as the power of choice for many different types of applications. If your calculator doesn’t have a square root function, use 1.73 as an approximation of the square root of 3. What is causing the .6 reading on one leg? A three-leg device controlling 30 amperes dissipates 108 watts versus a two-leg device controlling the same load dissipates 72 watts.

Three-phase electric power (industrial applications only) A three-phase electric motor. Supply us with details and maybe there is an adapter to be found. To find the power given current, multiply by the voltage and then the power factor to convert to W. For a three phase system multiply by three to get the total power. Amps per leg on three phase?? You would check voltage between two hot legs, not one leg to ground. Three phase is not like three parallel supplies. So if A-B, B-C and C-A are all 240 volts, then A-N and C-N will both be 120 volts, but B-N will be 208 volts. The line to neutral voltage (if it is a grounded system - 4 wires) is 480 / 1.732 = 277 volts. What is causing the .6 reading on one leg? For three phase circuits the power factor is the square root of 3. \$\begingroup\$ Those are just 2 of many phase and voltage configurations used by many countries. For example, a three phase circuit using 25,000 watts of power and a line voltage of 250 will have a current flow of 25,000/(250 x 1.73), which is equal to 57.80 amperes. An SCR dissipates approximately 1.2 watts per ampere passing through the device. HEAT - A three phase two-leg unit, will produce 1/3 less heat in the enclosure than a threeleg power control. If you screw up and wire a 220 volt machine to the 440 system, it will run real fast for a very short period of time.

You have a miss-match, as in not compatible. The remaining phase-to-neutral voltage will be √ 3 /2 the phase-to-phase voltage. A standard 3Hp, 208V VFD will also be rated about 11 amps (per phase). Three phase electricity.

Decided to check the amps on a three hp motor. Other types of three-phase supplies are wye connections, ungrounded delta connections, or corner-grounded delta ("ghost" leg configuration) connections. In this system, shown in Figure 11, the voltages are produced from one center-tapped transformer winding, and all voltages are in phase. Jraef. You will need a transformer to run 220 volt three phase and of course single phase.

Decided to check the amps on a three hp motor. 120 - 240 with a Delta high leg is an old industrial/residential power feed that still exist today. I will do that tomorrow. Actual power company voltage varies (220v / 230v / 240v) by region, but to simplify we’re going to focus on 240V. It isn’t like each phase can supply 200 amps at the same time. So a 240 volt, 20 amp three phase circuit carries the same power as three single phase circuits of equal voltage or 240 volts at 60 amps single phase while only adding one more wire.

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