HP LH4r HP Netserver LXr 8500 Rack Cabling Guide - Page 9

Chapter 1 Preparation for Cabling the HP NetServer LXr8500 If you install several HP NetServers on one circuit, however, precautions are necessary. For instance, if there is a power failure and power is then restored all the servers immediately begin to draw inrush current at the same time. If the circuit breakers on the incoming power line have insufficient capability, they may trip and thus prevent the servers from powering up. When preparing your site for installation, allow for the additional inrush current. Consider the following before installing the server in your environment: • In North America, a 20-amp-minimum circuit is to be used with one NEMA AB1 class 14B breaker for each 16-amp Power Distribution Unit that is to be connected to an HP NetServer LXr 8500. • In Europe: ◊ For a single LXr 8500 unit in a rack, use a 16-amp-minimum circuit with one IEC MCB C-type breaker for each 16-amp Power Distribution Unit. ◊ For multiple LXr 8500 units in a rack, use a 16-amp-minimum circuit with one IEC MCB D-type breaker for each 16-amp Power Distribution Unit. NOTE Some local codes do not allow a 16-amp device to be connected to a 16-amp service. Consult a qualified electrician or local regulatory authority before beginning electrical site preparation. Rack Assembly and Cabling Cautions and Warnings Unterminated Power Cords Require Licensed Electrician In some cases in the 230/240V environment, the Uninterruptible Power Supply (UPS) is shipped with a power cord that is unterminated. The reason is that the current demand of a fully loaded rack may exceed the demand for the normal circuit in some countries. Therefore, you should have a qualified electrician or electrical engineer analyze the current demand for each branch circuit used by rack mounted equipment. Proper wiring and cord termination are part of the same process. 5