It's called Opto Isolator.

Mains Powered

The water mains burst due to the earthquake.

Ringer option Mains to 48 volt power supply

In this case, the Opto Isolator is blinking in response to one's own blinks.

But if you've got mains as well, it will charge the batteries in there.

You pass the orange to the person behind you... mais sans servir les mains.

Strengthening of institutional structures technical assistance and training mains connections, including sewerage, inside the home environmental monitoring legal monitoring social assistance

22. quot Le contrat d apos entreprise clé en mains, le cas du Zaïre quot in Revue de l apos Institut de droit d apos expression française (IDEF), Paris, 1988

To improve living conditions for the urban population with basic unmet needs to facilitate access to basic mains services with social monitoring to ensure the programme apos s sustainability and replicability

The team learned of a European Commission and World Bank initiative to fund the repair of parts of the existing water treatment installation and the rehabilitation of the trunk mains, as well as to invest in groundwater production infrastructure.

More than half a billion roubles in capital investments was allocated and spent on these tasks in 2003 2004, thanks to which approximately 20,000 square metres of housing space and 84 kilometres of gas mains, two schools catering for 477 pupils and other sites were returned to use in the Bryansk, Kaluga, Orël and Tula regions in two years.