The term "gain" in the context of Electrical Metallic Tubing (EMT) refers to the amount of conduit that is "gained" or saved in a run of conduit due to the bending process. When making bends, the conduit length between the bends effectively becomes shorter than if it were laid out straight.
In the case of three 90-degree bends in a run of EMT conduit, the total gain would be the cumulative gain for the three bends.
Typically, each 90-degree bend has a standard gain value, which can differ slightly based on the radius of the bend and the diameter of the conduit. However, in most standard cases and for simplicity, we refer to a common reference for a 90-degree bend's gain.
Let's use a typical standard gain value. For EMT:
- A 90-degree bend usually has a gain of approximately 5 inches.
Since we need to account for three 90-degree bends, the total gain can be calculated as follows:
[tex]\[ \text{Total Gain} = 3 \times 5 \text{ inches} \][/tex]
[tex]\[ \text{Total Gain} = 15 \text{ inches} \][/tex]
Upon examining the answer choices provided:
- 077/8 inch
- 5 inches
- 44/5 inch
- 25/8 inch
None of these match 15 inches directly, suggesting there might be further context or standard bends used in a code not specified here. Given the discrepancies, verify whether the question context matches a specific industry standard or reference manual.
However, based on common practice and understanding, each 90-degree bend typically accounts for approximately 5 inches gain. Therefore, the closest consistent and widely accepted response in conduit installations with standard tools and methods might be related to simpler assumptions around the options provided.
Thus, I'll align with the best practice statement:
- If each single 90-degree bend's gain is about 5 inches [tex]\(\textbf{(O5 inches)}\)[/tex], per standard references, your answer for the gain in a comprehensive test or exam might align with the average gain per bend.
But note, for precise implementations, always consult a specific EMT bending manual or professional resources.
