An inspection of a building’s gas piping system shall be conducted at periodic intervals as set forth by rule of the commissioner, but such inspection shall be conducted at least once every five years.

Exceptions:

1. If the New York state public service commission adopts a rule or other requirement for periodic inspections of service lines, as defined in section 255.3 of title 16 of the New York codes, rules and regulations, with a frequency other than five years, the commissioner may, by rule, require that the periodic inspections required by this article be conducted with such frequency.

2. The initial inspection for a new building shall be conducted in the tenth year after the earlier of (i) the issuance by the department of a letter of completion or, if applicable, a temporary or final certificate of occupancy for such building or (ii) the date such building was completed as determined by department rule.