When making a lead and oakum joint on a bell and spigot pipe, the minimum depth of the lead in the joint shall be ___________________.

The correct answer is that the minimum depth of the lead in a lead and oakum joint on a bell and spigot pipe must be at least 1 inch. This specification is crucial for ensuring the integrity and durability of the joint. A minimum lead depth of 1 inch provides sufficient material to create a strong seal that can withstand the pressure and movement associated with plumbing systems. It allows the lead to properly fill the joint space, ensuring that it adheres well to both the bell and the spigot sections of the pipe, effectively preventing leaks and maintaining the overall effectiveness of the plumbing installation. Satisfying this requirement is essential for compliance with plumbing codes and helps to ensure a long-lasting and reliable pipe joint.