Which three parties must be satisfied with the completed electrical installation?

The completed electrical installation must satisfy the Owner, Architect, and Inspection authority because these three parties each play a crucial role in ensuring that the installation meets all necessary requirements and standards.

The Owner represents the client's interests, ensuring that the work is done to their satisfaction and adheres to the agreed-upon specifications. The Architect is involved in the design aspect, ensuring that the electrical installation integrates well within the overall architectural plans and complies with any design-related codes and regulations. The Inspection authority is responsible for verifying that all local codes, safety standards, and regulations are properly followed, providing a critical check on the quality and safety of the installation.

This trio's collaboration ensures that the project is completed to high standards, addressing the owner's needs, maintaining design integrity, and meeting regulatory compliance, which is vital for a successful electrical installation.