Which document is necessary for testing and certifying a final circuit?

The correct answer is the Electrical Installation Certificate (EIC) because this document is pivotal in the formal recognition of a completed electrical installation, ensuring it is safe to use and compliant with the relevant standards and regulations. The EIC serves as a comprehensive confirmation that the installation has been carried out in accordance with the required specifications, including verification of testing and certification of the final circuit.

Obtaining an EIC involves a systematic process of inspection and testing, corroborating that not just individual components but the entire circuit performs as expected under operational conditions. The certificate typically details the authenticity of the installation, including testing results and compliance with safety measures, thereby providing a formal and legal basis for the installation's use.

While the other options serve important roles in the electrical installation and testing process, they do not fulfill the requirements necessary for certifying a final circuit. An Electrical Test Report (ETR) outlines test results but does not imply completion of the entire installation; the Circuit Deviation Summary addresses any non-compliance issues during installation; and the Installation Completion Note indicates that the installation is finished but may lack the comprehensive assessment that an EIC provides. Thus, the EIC is the key document necessary for certification.