To support a 29 amp load at 208 volts from a properly connected transformer, what size KVA transformer is needed?

To support a 29 amp load at 208 volts from a properly connected transformer, what size KVA transformer is needed?

• A. .5
• B. .75
• C. 1.0
• D. 1.5

Answer: (B)

To determine the required size of a transformer in kilovolt-amperes (KVA) for a given load, you can use the formula: \[ KVA = \frac{Volts \times Amps}{1000} \] In this case, the load is 29 amps at 208 volts. Plugging in these values gives: \[ KVA = \frac{208 \times 29}{1000} \] Performing the calculation: 1. Multiply 208 by 29, which equals 6,032. 2. Divide 6,032 by 1,000 to convert it to KVA, resulting in 6.032 KVA. The transformer size must be rounded up to the nearest standard transformer size to ensure it can handle the load safely and effectively, as transformers are not available in every possible size. The standard size that can accommodate this load without being overloaded is 0.75 KVA. Therefore, .75 KVA is the most appropriate choice, ensuring the transformer can handle the load while also providing a margin for safety and efficiency. This means that selecting a transformer with an output of .75 KVA will meet the demand of the 29 amp load at 208 volts effectively.

To determine the required size of a transformer in kilovolt-amperes (KVA) for a given load, you can use the formula:

[ KVA = \frac{Volts \times Amps}{1000} ]

In this case, the load is 29 amps at 208 volts. Plugging in these values gives:

[ KVA = \frac{208 \times 29}{1000} ]

Performing the calculation:

1. Multiply 208 by 29, which equals 6,032.

2. Divide 6,032 by 1,000 to convert it to KVA, resulting in 6.032 KVA.

The transformer size must be rounded up to the nearest standard transformer size to ensure it can handle the load safely and effectively, as transformers are not available in every possible size. The standard size that can accommodate this load without being overloaded is 0.75 KVA.

Therefore, .75 KVA is the most appropriate choice, ensuring the transformer can handle the load while also providing a margin for safety and efficiency. This means that selecting a transformer with an output of .75 KVA will meet the demand of the 29 amp load at 208 volts effectively.