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------------------------------------------------ If an electric motor is rated for 208 V, what are the maximum and minimum allowable voltages?

A. 208 and 240
B. 187.2 and 228.8
C. 197.7 and 215.3
D. 187.2 and 238.8

To determine the maximum and minimum allowable voltages for an electric motor rated at 208 V, we need to account for standard voltage variations. Typically, an electric motor can safely operate at a voltage that is 10% higher or lower than its rated voltage.

Here’s how you can calculate it:

1. Calculate the Minimum Allowable Voltage:
- To find the minimum voltage, reduce the rated voltage by 10%.
- Formula: Minimum Voltage = Rated Voltage × (1 - 0.10)
- Plugging in the values: 208 V × 0.90 = 187.2 V

2. Calculate the Maximum Allowable Voltage:
- To find the maximum voltage, increase the rated voltage by 10%.
- Formula: Maximum Voltage = Rated Voltage × (1 + 0.10)
- Plugging in the values: 208 V × 1.10 = 228.8 V

Therefore, for an electric motor rated at 208 V, the minimum allowable voltage is 187.2 V, and the maximum allowable voltage is 228.8 V.

The correct option is B. 187.2 and 228.8.