The notified Salvadoran Technical Regulation establishes the technical requirements for designing and building the infrastructure for natural gas network distribution systems, as well as the conditions for the operation, maintenance, inspection, and abandonment or decommissioning of those networks. It applies exclusively to natural gas network distribution systems and covers the following activities: - The design of piping installations in natural gas networks, up to the outer boundary of the residential service, at the point where they enter the metering and regulating box or cabinet. - The construction or repair of natural gas distribution networks or supply branches installed in the public right-of-way and operating at a maximum pressure of 4,200 kPa (42 bar). - The performance of work and the minimum safety conditions applicable to the construction, operation, and maintenance of natural gas distribution systems. It also establishes environmental protection requirements to be met during such work.