8.3　Instrument Power Source

8.3.1　Instrument system shall be powered by three phase AC 380V，or single phase AC 220V power source.

8.3.2　Instrument air source shall be in accordance with the following requirements:

1　Instrument air may be cleaned compressed air or nitrogen，and if the latter is used，corresponding safety measures shall be taken to ensure personnel safety.

2　For instrument air，receiver shall be provided，of which the capacity shall be able to provide backup time of at least 10 minutes for the air consumption of important equipment if the working instrument air source fails.

3　The normal supply pressure of instrument air shall be 0.4MPa-0.6MPa.