When testing for pressures exceeding 100 psi, what is the maximum increment allowed on the testing gauge?

When testing for pressures exceeding 100 psi, the maximum increment allowed on the testing gauge is set to 2 psi. This specification is important because it ensures precision in pressure monitoring during tests. The tighter increment allows for more accurate readings, which is crucial for confirming the integrity of plumbing systems under high-pressure conditions.

Using a gauge with a 2 psi increment facilitates a careful evaluation of the system's performance and helps identify potential leaks or weaknesses that might not be evident with larger increments. A lower increment aids in compliance with safety standards, decreasing the risk of oversight during pressure testing.

Higher increments could lead to greater uncertainty in readings, which could compromise the overall safety and reliability of plumbing installations. Ensuring the correct increment is used is key to maintaining effective plumbing practices in accordance with the International Residential Code.