What certification or listing ensures an appliance meets safety standards during installation?

The choice that ensures an appliance meets safety standards during installation is the listing status by an authority. This listing indicates that the appliance has been tested and conforms to specific safety standards set by organizations recognized for their expertise in evaluating product safety. Authorities such as Underwriters Laboratories (UL), the Canadian Standards Association (CSA), or similar entities perform rigorous testing before granting this certification.

When an appliance is "listed," it means that it has passed these safety standards, which usually cover aspects like electrical safety, thermal performance, and material safety. This is critical during installation, as it assures both installers and end-users that the appliance is safe to operate within specified parameters.

In contrast, a manufacturer's warranty pertains to product reliability or performance and does not necessarily address safety compliance. A national safety certification can be a broad term that lacks the specificity that a listing provides. Lastly, an installation guide offers instructions on how to properly set up the appliance but does not guarantee that the appliance itself meets required safety standards. The listing status clearly establishes that an appliance has undergone extensive safety scrutiny, making it the correct answer in this context.