No oil supply line can be connected in walls or ceilings unless what is possible?

In the context of oil supply line installations, it is essential for maintenance and safety reasons that any line placed within structural elements such as walls or ceilings allows for accessibility. If access cannot be achieved without cutting through existing materials, it poses significant challenges for future inspections, maintenance, or repairs. This means that if an issue arises with the supply line, locating and addressing it could be cumbersome and potentially unsafe.

Therefore, the requirement that access must be possible without cutting through existing materials ensures that the oil supply line can be easily reached for inspection or repairs, providing a necessary safeguard for both the integrity of the system and the safety of its operation.

The focus on accessibility aligns with overall building codes and safety regulations that prioritize ease of access for maintenance work to prevent hazardous situations that could arise from undetected leaks or failures in the oil supply system.