What is a potential consequence of not converting all loads to a common basis before calculating currents?

What is a potential consequence of not converting all loads to a common basis before calculating currents?

• A. Could mis-match currents and lead to under- or over-sizing
• B. It will always overestimate the load
• C. It has no effect on sizing
• D. Voltage drop calculations will be incorrect but sizing unaffected

Answer: (A)

Converting all loads to a common basis ensures you’re adding like quantities so the total current reflects actual demand. If you skip this step, the individual loads might be summed in incompatible units or conditions, giving a total that doesn’t match how the system will respond in operation. The real risk is currents that don’t match what the equipment will actually carry, leading to feeders and conductors that are either undersized or oversized. Under-sizing can cause overheating and nuisance trips, while over-sizing wastes material and costs. So the potential consequence is mis-match currents and under- or over-sizing. The other statements aren’t correct because the effect isn’t limited to overestimating the load, sizing can be affected, and voltage-drop issues don’t occur in isolation from sizing.

Converting all loads to a common basis ensures you’re adding like quantities so the total current reflects actual demand. If you skip this step, the individual loads might be summed in incompatible units or conditions, giving a total that doesn’t match how the system will respond in operation. The real risk is currents that don’t match what the equipment will actually carry, leading to feeders and conductors that are either undersized or oversized. Under-sizing can cause overheating and nuisance trips, while over-sizing wastes material and costs. So the potential consequence is mis-match currents and under- or over-sizing. The other statements aren’t correct because the effect isn’t limited to overestimating the load, sizing can be affected, and voltage-drop issues don’t occur in isolation from sizing.