proyecto de norma oficial mexicana proy-nom-001-sede-2018 instalaciones electricas utilizacion draft mexican official standard proy-nom-001-sede-2018 electrical installations use 1167 pages in spanish the notified draft mexican official standard applies to the use of electrical installations operating at any voltage level and for the following purposes a public and private industrial commercial and residential premises regardless of their use including those used for electrical equipment connected by users b installations in buildings used by supply companies such as office buildings warehouses car parks mechanical workshops and buildings used for leisure purposes which are not an integral part of a power plant or substation c mobile homes leisure vehicles floating structures fairs circuses and exhibitions parking areas workshops meeting areas health facilities agricultural buildings marinas and wharves d all user installations situated outside buildings e fixed wiring for telecommunications signalling control and similar purposes excluding the internal wiring of apparatus f the extension or modification of installations and the parts of existing installations affected by such extensions or modification. g electrical installations of users that are connected to 1 general transmission networks 2 general distribution networks 3 stand-alone systems 4 individual electric power supply systems or 5 any other electrical power source. h private networks supplying electrical power to cargo centres. the notified draft mexican official standard is limited to the selection and suitability of electrical equipment for installation. it does not apply to a electrical installations on vessels and watercraft that are not floating buildings b installations on railway rolling stock aircraft electrical public transport units and motor vehicles that are not mobile homes or leisure vehicles c electrical installations for electrical public transport systems in terms of the generation transformation transmission or distribution of electrical power used exclusively for the operation of rolling equipment or signalling and communication installations d electrical installations in underground mining areas and self-propelled mobile machinery for surface mining and the supply cables for such machinery e installations involving communications equipment that are controlled exclusively by enterprises providing public communications services which are located outdoors or inside buildings used exclusively for such installations f installations controlled by electricity enterprises such as 1 aerial or lateral connections and the relevant meters which are not the property of users 2 installations belonging to or under the control of an electricity company for the purpose of communications measurement generation control transformation transmission or distribution of electrical power or 3 installations recognized by other control agencies with jurisdiction for such installations such as the energy regulatory commission. note public service enterprises are required to comply with the standards issued by the competent agencies