A pair of three-pole mechanical switches (111-112) control whether the primary or alternate power supplies are used.

A secondary source of power shall be sufficient to replace the primary source of power for a continuous period of three days.

EN4 Indirect energy consumption by primary source.

Which primary source of energy will be used in the production process?

Which primary source of energy will be used in the production process?

Life-cycle energy consumption by primary energy source, separately accounting for renewable energy use

A secondary power source (164) is configured to provide power to the field device (102) when the primary power source (162) is removed.

Solar cells, wind turbines and water turbines can act as the primary energy source.

The invention includes a novel cardioplegia solution in which pyruvate serves as the primary energy source.

Also, a backup energy source is operably connected to the stepper motor to operate the stepper motor when the primary energy source is not effective.

Glycerin a virtually zero-emission source of primary energy

Direct energy consumption by primary energy source, separately accounting for “renewable” energy use;

Direct energy consumption by primary energy source, separately accounting for “renewable” energy use;

Life cycle energy consumption by primary energy source, separately accounting for “renewable” energy use;

Each thrust producing module (11) has a fuel source and receives compressed air from the primary power source.