Technical Standards and Safety Authority (TSSA) G3 Practice Exam

In the absence of a readily accessible burner, an appliance not equipped with a continuous pilot shall be purged in accordance with:

1. Annex H of the B149.1-05 code

2. The manufacturer's instructions

3. Appendix A of the B149.2-05 code

4. The local distributors procedures

The correct answer is: Annex H of the B149.1-05 code

Choosing to purge an appliance that is not equipped with a continuous pilot in accordance with Annex H of the B149.1-05 code is the correct approach because this section specifically outlines the safe procedures for purging gas appliances. Purging involves removing air or combustible gas from the piping system prior to lighting or using the appliance again, ensuring safety by preventing explosions or fires. Annex H provides detailed guidance on the requirements and procedures that should be followed to ensure that the appliance is safe to operate, especially when a burner is not readily accessible. This ensures compliance with safety standards and mitigates risks associated with gas leaks. While the manufacturer's instructions could provide relevant information, they may not always cover the broader safety standards required for purging, which are specifically encompassed within the B149.1-05 code. Meanwhile, Appendix A of the B149.2-05 code primarily deals with the installation requirements for venting systems rather than purging gas appliances. Local distributor procedures might vary and may not be based on the rigorous standards set forth by established codes. Therefore, relying on the comprehensive guidance found in Annex H ensures adherence to the recognized safety protocols.