HP Visualize J5000 hp Visualize J5000, J7000 workstations site preparation gui - Page 22

Dedicated Circuits, Safety and Dedicated Grounds, Receptacles

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CAUTION Site Preparation Guidelines Preparing for Installation Dedicated Circuits The J Class workstation requires a dedicated circuit or individual branch circuits (separate circuit breakers). This ensures that there are no other devices to trip the circuit breaker and ensures that there is sufficient power to run the system. The current specification of each circuit breaker should be designed to allow for the system start-up surge. It is normal to have a start-up surge of 40 Amps for 10 milliseconds when the J Class workstation is first connected to a power outlet. For installations where a UPS is installed, the J Class workstation may experience a system start-up surge of up to 40 Amps for 10 milliseconds. In such cases, it is not abnormal to see sparks and/or a blue arc during the system start-up surge. However, if there is a circuit breaker between the UPS and the power outlet, the circuit breaker may be tripped. This is not usually the case; but, it is not an abnormal occurrence, either. Safety and Dedicated Grounds The primary reason for grounding electrical systems is safety. The safety ground is required by the National Electrical Code (USA) and most other local, regional, and national codes. In addition to the safety ground, Hewlett-Packard recommends that a dedicated (earth reference) ground be installed as a common reference point for all system components. Consult with your Hewlett-Packard CE and electrician to ensure that your system meets all national and local codes. Receptacles When receptacles are used to connect system components to AC power, the receptacles must include a dedicated ground connection that is insulated from the receptacle box. It is important that the receptacle box be grounded with an additional ground connection that is non-dedicated. (The additional ground can be a hard metal conduit.) When installing receptacles, ensure that each receptacle has its own neutral (if required) and ground. Using the same neutral or ground for more than one circuit will cause voltage loss and heat problems, and can 18 Chapter 2

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18
Chapter 2
Site Preparation Guidelines
Preparing for Installation
Dedicated Circuits
The J Class workstation requires a dedicated circuit or individual branch
circuits (separate circuit breakers). This ensures that there are no other
devices to trip the circuit breaker and ensures that there is sufficient
power to run the system.
The current specification of each circuit breaker should be designed to
allow for the system start-up surge. It is normal to have a start-up surge
of 40 Amps for 10 milliseconds when the J Class workstation is first
connected to a power outlet.
CAUTION
For installations where a UPS is installed, the J Class
workstation may experience a system start-up surge of up to
40 Amps for 10 milliseconds. In such cases, it is not abnormal to see
sparks and/or a blue arc during the system start-up surge.
However, if there is a circuit breaker between the UPS and the power
outlet, the circuit breaker may be tripped. This is not usually the case;
but, it is not an abnormal occurrence, either.
Safety and Dedicated Grounds
The primary reason for grounding electrical systems is safety. The safety
ground is required by the National Electrical Code (USA) and most other
local, regional, and national codes. In addition to the safety ground,
Hewlett-Packard recommends that a dedicated (earth reference) ground
be installed as a common reference point for all system components.
Consult with your Hewlett-Packard CE and electrician to ensure that
your system meets all national and local codes.
Receptacles
When receptacles are used to connect system components to AC power,
the receptacles must include a dedicated ground connection that is
insulated from the receptacle box. It is important that the receptacle box
be grounded with an additional ground connection that is non-dedicated.
(The additional ground can be a hard metal conduit.)
When installing receptacles, ensure that each receptacle has its own
neutral (if required) and ground. Using the same neutral or ground for
more than one circuit will cause voltage loss and heat problems, and can