Which statement best summarizes the handling of contractor's material and test certificates after installation?

• A. Both copies must be kept on site for reference.
• B. The original copy must be kept at the site, and the second copy kept at the owner's file.
• C. The original copy must be kept at the site and the second copy kept at the installing company's place of business in a separate file.
• D. No copies are kept after installation.

Answer: (C)

The main idea here is how to keep documentation from the contractor after the installation so that records are reliable and accessible for inspections and future work. The original material and test certificate should stay at the job site so inspectors or the building owner can verify what was installed and that it was tested properly during commissioning. At the same time, having a second copy kept by the installing company in a separate file at their place of business ensures the contractor maintains a complete, organized record for warranty work, future service, and any audits. This setup provides on-site availability for verification, while preserving the contractor’s own records for accountability and ease of reference. Keeping both copies on site, or having no copies at all, or placing the second copy with the owner would either risk loss, reduce accessibility for the installer, or remove the contractor’s control over the installation history.