There is some equipment that will operate on 208 volts even though it is rated to be use 240 volts.
See discuss question below.
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If your amp meter is showing 208 volts but you need 240 volts, you may need to check the connection or source supplying the power. Ensure that the voltage source can deliver 240 volts and that there are no issues with the wiring or circuit. Consider consulting with a qualified electrician to address the discrepancy and ensure safe operation.
To calculate watts, you need to multiply the voltage (in volts) by the current (in amps). For the 208 volts, 8 amps heating element: Watts = 208 volts * 8 amps = 1664 watts For the 110 volts, 8 amps heating element: Watts = 110 volts * 8 amps = 880 watts
On three phase 208 volts one leg does not have the potential of 208 volts. It takes two legs to provide the 208 volts. The potential is across AB, BC and CA. Voltage to the grounded neutral A-N, B-N and C-N will produce a potential of 120 volts. In a wye configured secondary three phase four wire you have the potential of 120/208 volts.
For a 13.8 kW electric heater at 208 volts, you would need a 3-phase circuit with a minimum of a 50-amp breaker to handle the load safely. This calculation is done by dividing the power (13,800 watts) by the voltage (208 volts) and then dividing by the square root of 3 (since it's a 3-phase system).
You will need a step-up transformer to convert 120 volts to 208 volts. This transformer will increase the voltage level while maintaining the same frequency. It is essential to select a transformer with the appropriate voltage rating and capacity for your specific application to ensure safe and efficient operation.
The watts is the volts times the amps So 208 x 50 watts, or 10.4 kW.