What document is required prior to starting construction on larger LP-Gas installations?

The correct document required prior to starting construction on larger LP-Gas installations is the LPG Form 501. This form serves as a crucial step in the regulatory process, ensuring that all required assessments, site evaluations, and design specifications are adequately reviewed before any physical work begins. By submitting the LPG Form 501, the installer not only adheres to safety and compliance requirements but also takes the necessary steps to prevent any potential hazards associated with LP-Gas installations. This form collects essential information about the proposed construction, allowing regulatory bodies to evaluate the project thoroughly.

In contrast, the other options either serve different purposes or are not specific to the construction phase. The LPG Form 500A is typically related to service approvals, while the LPG Form 100 is often used for different types of applications or permits rather than construction initiation. The LPG Initial Safety Form is focused on ensuring that operations meet safety standards but does not specifically address the requirement to start construction on larger installations.