For gas supply lines, the thread cut on each joint must ensure what kind of fit?

The correct answer is a tight fit for gas supply lines, as this is paramount to ensuring safety and preventing leaks. Gas supply lines must be tightly fitted to create a secure seal where the threaded joints meet. This tightness prevents any escape of gas, which is crucial given the potentially hazardous nature of gas leaks. A tight fit helps to maintain the integrity of the gas system, ensuring that it operates efficiently while minimizing any risk of exposure to flammable gases.

In various gas installations, a proper threaded joint guarantees that the connection can withstand pressure and does not allow for any movement that might compromise the seal. This is especially important in high-pressure situations or where vibrations may occur. As a result, maintaining a tight fit in these connections not only aligns with safety standards but also ensures compliance with industry regulations.