How far must meters installed inside be from an ignition source or heat source?

Meters installed indoors must be positioned at least 3 feet away from any ignition source or heat source. This distance is crucial for safety reasons, as it reduces the risk of accidental ignition of gas due to heat or sparks. Maintaining this distance helps to mitigate the potential effects of heat on the meter and prevents any chance of flare-up in the event of a leak or malfunction. The code requirements reflect an understanding of the hazards associated with gas appliances and their environment, hence ensuring safety in residential and commercial installations. Other distances such as 2, 4, or 5 feet may not adequately account for the safety buffer necessary to prevent heat exposure, which could lead to unsafe situations.