Compaq AlphaServer 160 User Manual page 83

About the Power System
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Each rack houses two AC input boxes. AC input box circuit breakers are
accessible from the rear of the cabinet.
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Each system drawer requires one power subrack.
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Each system drawer requires two power supplies.
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Each power subrack holds up to three power supplies. The third power
supply is used for redundancy.
Rack Variants
The H9A20 RETMA cabinet has three variants:
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H9A20-CA, North American (120V)
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H9A20-CB, European (220–240V)
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H9A20-CC, North American and Japanese (200–240V)
GS80 Rack System Configuration Rules 5-5