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For heavy duty industrial type electrostatic precipitator

[A].	from 30000 to 100000 volts dc is normally required	[B].	from 240 to 440 volts dc is normally required
[C].	from 13000 to 18000 volts dc is normally required	[D].	from 1000 to 5000 volts dc is normally required

Answer: Option A