HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 242

Appendix D. Back-to-Back Racking Installation Procedure Installation Procedure 1. Confirm power requirements Ensure that the installation site meets the following requirements. • Input voltage: 200/230/240 VAC single phase • Input frequency: 50 Hz/60 Hz • Input current: 16 A maximum, operating (per PDU) US installations Standard 20A Square D circuit breakers are adequate for all authorized configurations of back-to-back racking. European circuit breakers In Europe, some sites may require upgraded circuit breakers. This is because inrush current for a single disk enclosure may be has high as 57.16 amps peak for up to three milliseconds. Note the figures in the following comparison chart: Tripping characteristic code B C D Z K Current multiplier 6X 12X 25X 4X 17X Total trip current Back-to-Back Rack usability 96A 192A 400A 64A 272A Do not use with BTBR Up to 5 redundant disk enclosures Up to 5 redundant disk enclosures or up to 8 non-redundant disk enclosures Do not use with BTBR Up to 5 redundant disk enclosures or 8 non-redundant disk enclosures In Europe, therefore, site preparation must include 16 amp circuit breakers, preferably with the D or K tripping characteristic code. CAUTION! Intermittent power losses will occur if improper circuit breakers are used. Racking 242