HP LH4r HP Netserver LPr Rack Cabling Guide - Page 18

Site Preparation: Circuit Breakers

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Chapter 2 Connecting and Routing Cables to the HP NetServer LPr System Parameters Hostname IP address Subnet Mask Gateway IP Address Gateway Host Name DTC Node Name Hardware Configuration, Cables, and Additional Devices Availability of I/O paths and SCSI addresses for add-on devices Availability of I/O backplane slots, memory slots, and so on Valid, supportable configuration for added devices, interfaces, memory, and so forth Correct type and length of cables, as specified in order documents Site Preparation: Circuit Breakers When you connect the HP NetServer LPr to an AC power source, the server temporarily draws a large "inrush current." This occurs even when the system is in standby mode. Inrush current is much greater than the server's normal operating needs. Generally, your external AC power source can handle the inrush current. If you install several HP NetServers on one circuit, however, precautions are necessary. If there is a power failure and power is then restored, for instance, 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. See Appendix A, "Specifications," for power requirements. 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 LPr. • In Europe: ◊ For a single LPr unit in a rack, use a 16-amp-minimum circuit with one IEC MCB C-type breaker for each 16-amp Power Distribution Unit. 14

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Chapter 2
Connecting and Routing Cables to the HP NetServer LPr
14
System Parameters
Hostname
IP address
Subnet Mask
Gateway IP Address
Gateway Host Name
DTC Node Name
Hardware Configuration, Cables, and Additional Devices
Availability of I/O paths and SCSI addresses for add-on devices
Availability of I/O backplane slots, memory slots, and so on
Valid, supportable configuration for added devices, interfaces, memory, and so forth
Correct type and length of cables, as specified in order documents
Site Preparation: Circuit Breakers
When you connect the HP NetServer LPr to an AC power source, the server
temporarily draws a large "inrush current." This occurs even when the system is
in standby mode. Inrush current is much greater than the server's normal
operating needs. Generally, your external AC power source can handle the inrush
current.
If you install several HP NetServers on one circuit, however, precautions are
necessary. If there is a power failure and power is then restored, for instance, 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. See Appendix A,
"Specifications," for power requirements.
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 LPr.
•
In Europe:
◊
For a single LPr unit in a rack, use a 16-amp-minimum circuit with
one IEC MCB C-type breaker for each 16-amp Power Distribution
Unit.