Which of the following is NOT a requirement for the placement of gas meters?

The placement of gas meters is governed by specific safety standards to minimize risk and ensure proper operation. The correct choice refers to the requirement that gas meters must be located at least 10 feet from a street. This distance aims to protect the gas meter from potential damages due to traffic and to ensure safety for both pedestrians and vehicles. It is not a commonly mandated requirement in all codes since some might prioritize local conditions or specific site evaluations.

In contrast, the other options highlight necessary safety measures. Gas meters should indeed be installed in ventilated spaces to prevent the accumulation of dangerous gas fumes. Keeping gas meters at least 3 feet away from ignition sources, like pilot lights or electrical equipment, is crucial to reduce the risk of fire. Similarly, ensuring they are not less than 3 feet from a heat source helps protect the meter from conditions that could affect its performance or lead to hazardous situations.

Overall, the choice regarding the distance from streets does not universally apply, making it the correct answer among the options provided.