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The device should be marked with the voltage range it works over. If the device is run at a voltage above that range it could be dangerous or the device could be damaged
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208 volt device on 240 volts
No. The device will operate over its given specified wattage rating. A 208 volt device run off of 240 volt will have an output increase. Ohms law stated that current is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit. A 240 volt heater can be run off of 208 but the wattage will be reduced.
For example lets use a baseboard heater. If the heater is 5000 watts at 208 volts, the current is I =W/E 5000/208 = 24 amps. The resistance of the heater is R = W/I (squared) =5000/24 x 24 (576) = 8.68 ohms. Applying 240 volts on the same heater whose resistance is 8.68 ohms results in this new heater wattage rating. W = E (squared)/R = 240 x 240 (57600)/8.68 = 6636 watts. This is 1636 watts higher than the manufacturer's safety rating and could destroy the equipment..
W = watts, I = amperage, R= resistance in ohms and E = voltage.
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∙ 10y ago
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∙ 15y agoyes if you use an auto transformer buck and boost to step up voltage, note primary current would be almost double secondary current of transformer.
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What is the maximum volts that can be used on a 208 230 volt motor?
You should not go above 240 volts for that type of motor.
Is it possible to hook up a unit that is 208 volt single phase to a 240 volts 3 phase?
Any two legs of a three phase system are classed as single phase. If a 208 volt device is connected across two legs of a 240 volt system its current draw will be higher. It is not recommended to connect a 208 volt device to a 240 volt supply. Using a constant resistive load of 6000 watts for an example, the resistance of the unit at 208 volts has to be found. R = E (squared)/W = 7.21 ohms. Now using the formula to find amperage at this resistance I = E/R, 208/7.21 = 28.84 amp at 208 volts. If the 208 volt device is connected to a 240 volt supply the following condition happens. I = E/R, 240/7.21 = 33.29 amps. The device in now definitely overloaded and instead of its rated 6000 watts it is outputting W = A x V, 33.29 x 240 = 7989 watts almost 2000 watts more than the unit is rated at.Using a 240 volt rated device on 208 volts is more forgiving and is done quite often. Using the same 6000 watts on 240 volts the resistance is calculated to be R = E (squared)/W = 9.6 ohms. If the 240 volt device is connected to a 208 volt supply the following condition happens. I = E/R, 208/9.6 = 21.67 amps. To check this connection's wattage W = A x V, 21.67 x 208 = 4507 watts or about 1500 watts below its rated output at 240 volts.If the connected load is a constant wattage like a motor, the amperage and voltage will change to maintain the constant wattage. I = W/E. A motor rated at 6000 watts at 240 volts will draw 25 amps. A motor rated at 6000 watts at 208 volts will draw 28.8 amps.The CEC states that if a 208 volt rated motor is connected to a 240 volt supply its full load current has to be increased by 10 % for its overload protection.If the three phase source is delta connected, and the neutral/ground is at the center tap of one of the phase windings, then there is 208 volts available from neutral to the third phase leg. In this case, there would be no mismatch of voltage, and the 208 volt load will operate as designed.This particular configuration is not so common. It is sometimes used in a light industrial setting where a fourth transformer for the 120/240 split phase portion is not used - it provides 240 three phase delta only, 120/240 split single phase, residential style, and 208 single phase.See related links below (High Leg Delta)Note that 240 three phase loads are also not so common. In the case where 480 three phase is required in this configuration, then there is a step up transformer trio provided, ususally by the customer.
Can you install a receptacle that is rated for 240 volts to a 277 volt line?
No, the receptacle's rating is 240 volt and that is the maximum voltage allow to be applied to that device. To prevent this condition from happening 277 volt receptacles and switches have a larger box that they fit into. The retaining screws are set apart further that a 240 volt device which makes it impossible to install a 240 volt device in a 277 volt junction box.
Do you need a step down transformer to run a 208 volt steam table on 240 volt feed?
Yes a transformer should be used. The steam table needs its correct voltage otherwise on 240 volts it will operate over its given specified nameplate wattage. A 208 volt heating element run off of 240 volt will have an output increase by 75 percent.
Can 240 volt appliances from NZ run on 240 Volts in the US?
yes 240volts is 240 volts
What is the maximum volts that can be used on a 208 230 volt motor?
You should not go above 240 volts for that type of motor.
What is a 208 circuit?
The 208 volt configuration is one phase of a three phase source at 240 volts, where the 208 volt circuit is connected between the center tap of one 240 volt phase (usually a grounded neutral, in the style of a standard 120/240 split phase system) and the high delta connection on either of the other two phases. 208 circuit would consist of two phases of a 208 volt wye system or could be all three phases. The voltage between conductors would be 208 volts. The voltage to ground from any phase would be 120 volts. A 240 volt delta system would give you a high leg to ground, somewhere around 190 volts and the other two would be 120 volts to ground.
Is it possible to hook up a unit that is 208 volt single phase to a 240 volts 3 phase?
Any two legs of a three phase system are classed as single phase. If a 208 volt device is connected across two legs of a 240 volt system its current draw will be higher. It is not recommended to connect a 208 volt device to a 240 volt supply. Using a constant resistive load of 6000 watts for an example, the resistance of the unit at 208 volts has to be found. R = E (squared)/W = 7.21 ohms. Now using the formula to find amperage at this resistance I = E/R, 208/7.21 = 28.84 amp at 208 volts. If the 208 volt device is connected to a 240 volt supply the following condition happens. I = E/R, 240/7.21 = 33.29 amps. The device in now definitely overloaded and instead of its rated 6000 watts it is outputting W = A x V, 33.29 x 240 = 7989 watts almost 2000 watts more than the unit is rated at.Using a 240 volt rated device on 208 volts is more forgiving and is done quite often. Using the same 6000 watts on 240 volts the resistance is calculated to be R = E (squared)/W = 9.6 ohms. If the 240 volt device is connected to a 208 volt supply the following condition happens. I = E/R, 208/9.6 = 21.67 amps. To check this connection's wattage W = A x V, 21.67 x 208 = 4507 watts or about 1500 watts below its rated output at 240 volts.If the connected load is a constant wattage like a motor, the amperage and voltage will change to maintain the constant wattage. I = W/E. A motor rated at 6000 watts at 240 volts will draw 25 amps. A motor rated at 6000 watts at 208 volts will draw 28.8 amps.The CEC states that if a 208 volt rated motor is connected to a 240 volt supply its full load current has to be increased by 10 % for its overload protection.If the three phase source is delta connected, and the neutral/ground is at the center tap of one of the phase windings, then there is 208 volts available from neutral to the third phase leg. In this case, there would be no mismatch of voltage, and the 208 volt load will operate as designed.This particular configuration is not so common. It is sometimes used in a light industrial setting where a fourth transformer for the 120/240 split phase portion is not used - it provides 240 three phase delta only, 120/240 split single phase, residential style, and 208 single phase.See related links below (High Leg Delta)Note that 240 three phase loads are also not so common. In the case where 480 three phase is required in this configuration, then there is a step up transformer trio provided, ususally by the customer.
Do all electric ovens cooktops ranges and clothes dryers operate on 208v as well as 240v?
No, use only the voltage for the appliance that your utility system is supplying to your residence. If your system is 208 volts use 208 volt appliances. Likewise if the utility system is 240 volts use only 240 volt appliances. 208 appliances on 240 will overheat the appliances and 240 appliances on 208 will not produce the wattages that the manufacturer recommends for cooking and drying.
Can you install a receptacle that is rated for 240 volts to a 277 volt line?
No, the receptacle's rating is 240 volt and that is the maximum voltage allow to be applied to that device. To prevent this condition from happening 277 volt receptacles and switches have a larger box that they fit into. The retaining screws are set apart further that a 240 volt device which makes it impossible to install a 240 volt device in a 277 volt junction box.
Do you need a step down transformer to run a 208 volt steam table on 240 volt feed?
Yes a transformer should be used. The steam table needs its correct voltage otherwise on 240 volts it will operate over its given specified nameplate wattage. A 208 volt heating element run off of 240 volt will have an output increase by 75 percent.
Can 240 volt appliances from NZ run on 240 Volts in the US?
yes 240volts is 240 volts
Amp meter is showing 208 volts I need 240 volts?
There is some equipment that will operate on 208 volts even though it is rated to be use 240 volts.See discuss question below.
Can you put a 120 v receptacle on a 240 v circuit breaker?
No, the electrical insulation rating of a 15 amp duplex receptacle is only rated at 130 volts. The 15 amp 240 volt receptacle is rated at 250 volts. The 240 volt receptacle also has a tandem pin configuration instead of the parallel configuration of the 120 volt device. The different pin configuration is so that a 120 volt electrical device can not be plugged into a 240 voltage receptacle.
How many volts can b drawn off a 240 volt breaker?
240 volts maximum.
I have a electrical dryer 240 receptacle that reads 208 on voltmeter and the dryer display reads Pwr Failure and will not operate were did the other 30 volts go?
I am assuming that you have just moved into a new apartment building. Commercial building power systems are changing to 3 phase. The 3 phase voltages are 120/208. 240 volt equipment will run on 208 voltages but at a reduced wattage output. For example Watts = amps x volts. Say your dryer draws 20 amps x 240 volts = 4800 watts. Now at reduced voltage, 20 amps x 208 volts = 4160 watts. As you can see your dryer won't get as hot and will take longer to dry. Most apartments that come with appliances will be rated at 208 volts. See what your dryer manufacturer has to say about getting around the Power failure alarm or whether it can be bypassed to operate on the lower voltage. Other option is to sell the 240 volt dryer and buy a 208 volt dryer. at 208 volts it will not draw 20 amps either
How can you get a 240V single-phase power from a 120V 3-phase service?
First of all there is no common three phase 120 volt service. There is in North America a three wire 120/240 volt single phase service. That being said, if you want to change a 120 volt source to 240 volts it must be done with a transformer. Its classification is a step up transformer. The primary side of the transformer H1 - H2 will be connected to the 120 volts. The secondary side of the transformer X1 - X2 will be connected to the 240 volt load. The transformer is sized by the current required by the 240 volt load.
