In 1990, within the scope of a project of national standardisation, ENEL issued technical specifications relating to the construction of alarm annunciators such as:

FOR "HV" ELECTRIC STATIONS

- Alarm and synthesis signalling units LV1 and TV1

- Alarm units type "E" LV6 and TV6

- Standardised units for "DRY REED" relays LV11 and TV11

- Signalling points type "D" LV4

- Interface terminals to combine with "DRY REED" relays LV28

FOR PRIMARY DISTRIBUTION SUBSTATIONS CONTROL PANEL "BT"

- Signalling device for reduced auxiliary services
   DQ1072A2NCI
- Circuit-breaker manoeuvre switch for primary
  substation command and control device
   DQ1987A2NCI
- Circuit-breaker manoeuvre switch command and control
  device for primary substation with fixed or mobile single bay coil
   DQ2026A2NCI
- Hybrid line and earth circuit-breaker command and control
  device for simplified primary substation
   DQ1931A2NCI