HP 200 HP StorageWorks 200 Storage Virtualization System site preparation guid - Page 34

AC connections, Power line transients, Protection against sources of electrical interference

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AC connections The system rack has four separate connections to 200 VAC, single-phase, 20-amp power. When receptacles are used to connect system components to AC power, they must include a dedicated ground connection that is insulated from the receptacle. It is important that the receptacle box be grounded with an additional ground connection that is separate from the dedicated ground. The additional ground can be hard conduit. Specific AC power cords and plugs are available to suit the power requirements and receptacles in your location. You can specify the cords and plugs you need when you order the HP 200 Storage Virtualization System. You are responsible for having the correct plugs and receptacles installed by an electrician in compliance with local electrical requirements and practices. CAUTION: When installing the receptacles, the electrician must ensure that each receptacle has its own neutral (if required) and ground. Using the same neutral/ground for more than one circuit causes voltage loss and heat problems and can create a fire hazard. A shared neutral conductor that fails open-circuit can cause overvoltage damage to equipment. See "Chapter 3 Electrical specifications" for specific power requirements as well as plug and receptacle part numbers and ordering information. Power line transients Heavy electrical loads from nearby machinery or equipment (for example, elevators or electric welders) can cause intermittent system problems with sophisticated electronic equipment, even if that equipment is on a separate circuit breaker. When faced with these conditions, provide a separate, completely independent power panel with an isolated ground and circuit breaker coming directly from the main building power source or secondary power source. If necessary, an HP representative can measure your power line noise level and make appropriate recommendations concerning the use of line treatment devices. Protection against sources of electrical interference Protect the system from sources of electrical interference: Potential source Description Wall outlets Convenience power outlets for building maintenance equipment (such as vacuum cleaners and floor buffers) must be wired from circuit breakers on a power panel separate from the computer system panel. The ground wires from these outlets must be connected to the normal building distribution panel and not to the system ground. If a separate power source and separate ground are not provided, operation of janitorial equipment can induce electrical noise and cause abnormal operation of the computer system. Your electrician can verify whether maintenance outlets are on separate panels. Lightning In geographical areas subject to lightning storms, it may by advisable to install lightning protection for both personnel and computer systems. The principles of lightning protection and personnel safety are outlined in detail in the lightning protection code contained in the National Fire Protection Association (NFPA) Handbook. Electromagnetic interference The HP system is specifically designed to reduce its susceptibility to radiated and conducted interference. Electromagnetic interference can cause a variety of system problems. An HP representative can advise you about the most common causes of electromagnetic interference. 34 Site requirements

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AC connections
The system rack has four separate connections to 200 VAC, single-phase, 20-amp power.
When receptacles are used to connect system components to AC power, they must include a dedicated
ground connection that is insulated from the receptacle. It is important that the receptacle box be
grounded with an additional ground connection that is separate from the dedicated ground. The
additional ground can be hard conduit.
Speci
fi
c AC power cords and plugs are available to suit the power requirements and receptacles in
your location. You can specify the cords and plugs you need when you order the HP 200 Storage
Virtualization System. You are responsible for having the correct plugs and receptacles installed by an
electrician in compliance with local electrical requirements and practices.
CAUTION:
When installing the receptacles, the electrician must ensure that each receptacle has its own neutral (if
required) and ground. Using the same neutral/ground for more than one circuit causes voltage loss
and heat problems and can create a
fi
re hazard. A shared neutral conductor that fails open-circuit
can cause overvoltage damage to equipment.
See
"
C
h
a
p
t
e
r
3
E
l
e
c
t
r
i
c
a
l
s
p
e
c
i
fi
c
a
t
i
o
n
s
"
for speci
fi
c power requirements as well as plug and receptacle
part numbers and ordering information.
Power line transients
Heavy electrical loads from nearby machinery or equipment (for example, elevators or electric welders)
can cause intermittent system problems with sophisticated electronic equipment, even if that equipment
is on a separate circuit breaker. When faced with these conditions, provide a separate, completely
independent power panel with an isolated ground and circuit breaker coming directly from the main
building power source or secondary power source.
If necessary, an HP representative can measure your power line noise level and make appropriate
recommendations concerning the use of line treatment devices.
Protection against sources of electrical interference
Protect the system from sources of electrical interference:
Potential source
Description
Wall outlets
Convenience power outlets for building maintenance equipment (such as vacuum
cleaners and
fl
oor buffers) must be wired from circuit breakers on a power panel
separate from the computer system panel. The ground wires from these outlets
must be connected to the normal building distribution panel and not to the system
ground. If a separate power source and separate ground are not provided,
operation of janitorial equipment can induce electrical noise and cause abnormal
operation of the computer system. Your electrician can verify whether maintenance
outlets are on separate panels.
Lightning
In geographical areas subject to lightning storms, it may by advisable to install
lightning protection for both personnel and computer systems. The principles of
lightning protection and personnel safety are outlined in detail in the lightning
protection code contained in the National Fire Protection Association (NFPA)
Handbook.
Electromagnetic
interference
The HP system is speci
fi
cally designed to reduce its susceptibility to radiated and
conducted interference. Electromagnetic interference can cause a variety of system
problems. An HP representative can advise you about the most common causes of
electromagnetic interference.
34
Site requirements