2007年1月9日 · 120 / 208 three phase 120 / 240 three phase 277 / 480 three phase In my list, the first number (in blue) is the voltage from hot to neutral. The second number (red) is the voltage from hot - to - hot on the different phases. Some loads use all three phases, and no neutral. Some use a hot and a neutral, it depends on the load.

2007年2月25日 · An appliance must be marked according to the voltage it is rated (422.60(A)) and connected to the voltage for which it is rated (110.3(B)). To connect a 208V range to a 240V source would be a listing violation, unless the range is marked to be connected to a …

2020年6月2日 · Voltage between two of the legs measured to ground/neutral would be 120V each, and the other "high" leg would be 208V to ground/neutral. The reason every 3rd space is blanked off is so someone doesn't try to run a single pole …

2022年12月29日 · My understanding is that in a 3-phase delta configuration, the voltage between any 2 of the 3 hot conductors would be 240 volts, but my question is: why wouldn't it be 208 volts (as it would be in the 3-phase wye configuration) since in both cases the current in those conductors are 120 degrees out of phase with each other. It seems to me that ...

A 208Y/120V, 4 wire system has some loads with 3-pole CB which are 3 phase, 1 pole CB which are single phase. But what about the 2-pole CB loads, are these considered 2ph loads or single loads? which formula is applicable in this case: current= kW/(208V) or current=kW/(208*sqrt(2)*pf)? thnaks

2015年11月21日 · A three phase wye system with a nominal 208 V line to line voltage has a nominal 120 V line to neutral voltage (208/1.732). You can power either a 208 single phase load from two ungrounded lines, or a 120 V single phase load from any ungrounded line to neutral. If you had a 240 V wye system, then line to neutral would be 139 V.

2024年6月21日 · 208 v is a three-phase supply voltage used in North America, carried on a 4-wire system.The voltage between one of the three live wires and the neutral wire is 120 v and a single-phase supply can ...

2021年5月25日 · You need a step up transformer, 208 to 480 volt with a delta primary and a wye secondary if the machine is not dual voltage. You can get away with reverse feeding a 480 to 208 transformer, but the 480 volt side is typically a delta winding and you would need to either make it a corner grounded system or provide ground detectors to indicate a ...

2006年3月9日 · The theory was at every 60 degrees and when one of the phases is equal to zero this is when a 208 voltage appears. This would mean that for every cycle 208 appears 6 times. I personally do not completely buy this theory.

2011年5月11日 · Voltage ratings Voltage ratings Speaking of the code ... thoughout the NEC it is common to see ratings posted as 120/208-volt or 277/480-volt system (Art. 100, Voltage to Ground). In 220.5 Calculations, it is spelled out as 208Y/120 and 480Y/277 and it is probably for uniformity and consitency.