What type of signature is prohibited on installation labels?

Installation labels must reflect authenticity and accountability, which is why a stamped signature is prohibited. A stamped signature lacks the personal touch and verification that come with a handwritten signature, making it easy to replicate and difficult to trace back to an individual. This lack of personal identification is why it's critical to avoid stamped signatures on installation labels, as they do not demonstrate the responsibility or engagement of the individual responsible for the installation.

On the other hand, electronic, witness, and typed signatures may have their own contexts and relevance in different scenarios, but they do not carry the same concerns regarding authenticity. Electronic signatures can be securely managed, witness signatures provide a level of verification, and typed signatures, while less personal, can still be associated with individual accountability depending on the process through which they are affixed.